iz8dwf
From the project to the gadget: making a small PCB.
updated
A big failure event killed many ICs at the same time.
This game is a clone of Cinematronics' Rip Off, it seems they had no better name for it and just removed one final 'f'.
Previous videos about these arcade repair:
youtube.com/watch?v=6lpwsrjBsOc
youtube.com/watch?v=j_siDBxwS5w
youtube.com/watch?v=GSS1ZmciQ54
youtube.com/watch?v=NQIdLe4Drkw
Timeline:
00:00 - Welcome
01:08 - The Big Failure
16:00 - Working again
It seemed an easy enough task, but then the logic PCB died after running with no issues for a few hours.
This game is a clone of Cinematronics' Rip Off, it seems they had no better name for it and just removed one final 'f'.
Previous videos about these arcade repair:
youtube.com/watch?v=6lpwsrjBsOc
youtube.com/watch?v=j_siDBxwS5w
youtube.com/watch?v=GSS1ZmciQ54
Timeline:
00:00 - Physical inspection
00:40 - Missing parts
01:41 - Video PCB
06:58 - Audio PCB & wirings
08:50 - All boards powered
10:01 - Fixing the audio
11:50 - Testing the game
ebay. Unfortunately I've discovered it had a few missing parts (and not so
easy to find ones).
After repairing the AC frontend, a calibration is required, but I haven't got the correct gears to do that.
Part 1 repair video:
youtube.com/watch?v=oEouc64MWAs
Solartron 7151 manuals:
http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Solartron/Solartron_7151_Computing_Multimeter
GPIB to USB converter project:
http://www.dalton.ax/gpib/
Timeline:
00:00 - Welcome
00:32 - Instrument's mods
02:34 - AC calibration plans
07:52 - DC/ohms comparison
Timeline:
00:00 - Welcome
01:22 - SX4 mini tour
02:10 - Hot ROM
02:59 - It's PLA's fault
04:03 - Extracting CPU PCB
My 82S100 PLA and its soviet clone video:
youtu.be/nicaN-IdzNI
Timeline:
00:00 - Welcome
02:03 - Floppy options for PETs
04:49 - A suitable disk drive
06:13 - Servicing & testing the drive
09:38 - Spindle speed check
12:55 - Head stepper 1-0-1
26:21 - Read/Write tests
29:44 - Design goals
IEEE single floppy drives:
zimmers.net/cbmpics/dlieee.html
SFD-1001 floppy drive:
c64-wiki.com/wiki/SFD-1001
petSD:
petsd.net
Greaseweazle:
github.com/keirf/greaseweazle
stepper motor information:
globalspec.com/reference/8273/348308/3-8-4-stepper-motors
Commodore 1541 troubleshooting and repair guide:
archive.org/details/Commodore_1541_Troubleshooting_and_Repair_Guide
Commodore disk drives compatibility issue:
http://www.6502.org/users/andre/petindex/drives/writegap.html
This game is a clone of Cinematronics' Tailgunner.
Previous videos about these arcade repair:
youtube.com/watch?v=6lpwsrjBsOc
youtube.com/watch?v=j_siDBxwS5w
Timeline:
00:00 - Physical inspection
03:27 - Audio PCB
05:08 - Video PCB
12:45 - Power ON
13:49 - Monitor's mistery mod
16:02 - Fixing the audio
17:47 - Fixing the logic PCB
20:09 - Analog joystick
22:52 - Game fixed & back home
with the Vectorbeam/Cinematronics BW logic video output.
this video's project:
github.com/iz8dwf/vectorbeam-eliminator
Vectorbeam/Cinematronics CCPU information:
http://www.zonn.com/Cinematronics/index.htm
Wikipedia list of arcade vector games:
en.wikipedia.org/wiki/Category:Vector_arcade_video_games
Arcade Museum page about Space Wars:
arcade-museum.com/game_detail.php?game_id=9691
Timeline:
00:00 - Welcome
01:13 - Vectorbeam's "vectors"
02:52 - (Old) monitor's quirks
07:35 - Adapter's design
16:35 - First prototype
17:57 - The misterious offsets
23:36 - It works!
Timeline:
00:00 - Welcome
01:05 - Power supply accident
02:30 - Fixing the transformer (1st)
03:51 - Checking various parts
05:06 - Power on and voltage tests
07:19 - Unexpected magic smoke
11:50 - Finding the real issue
15:04 - Power supply works!
15:48 - And it doesn't work again
17:57 - Last issue is the first one
Music in this video:
Snowy Peaks pt II - Chris Haugen
inside the 5080-1718 thermistor assembly goes open circuit. This lamp needs its envelope broken for the circuit to work properly.
Timeline:
00:00 - Welcome
01:07 - opt-001 fault
02:16 - Troubleshooting
04:04 - The faulty part
05:18 - Broken lamp?
10:01 - Failed attempt
11:27 - Rebuilding the thermistor
12:28 - First test
13:47 - Second not so easy one
15:37 - Lamp differences
17:52 - Second one works too
Various HP-8640B manuals:
http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=HP_Agilent/HP_8640_Signal_Generator
Filament lamps introduction:
us.rs-online.com/m/d/04fe4bc2ac7e247d70e8e7d88fe48b19.pdf
Music in this video:
No.4 Piano Journey - Esther Abrami
Timeline:
00:00 - Welcome
01:00 - Bad Crystal
01:25 - Burnt connector pads
08:10 - Untrimmed pins
12:24 - Traces shorted
15:12 - It lives again
IZ8DWF's Atari Asteroids previous repair videos:
youtube.com/watch?v=IHRH3E0EtLg
youtube.com/watch?v=Tu10tQlWd3Y
youtube.com/watch?v=06chac2uBc0
youtube.com/watch?v=35YR62yv3-E
My rather useless ram diagnostic code for Asteroids:
github.com/iz8dwf/Asteroids-diag
Great video about Atari XY arcade vector generators
youtube.com/watch?v=smStEPSRKBs
Atari Asteroids related information:
en.wikipedia.org/wiki/Asteroids_(video_game)
http://www.andysarcade.de/asteroids.html
arcade-museum.com/game_detail.php?game_id=6939
http://www.jmargolin.com/vgens/vgens.htm
Commodore 8050 document archive:
http://www.zimmers.net/anonftp/pub/cbm/schematics/drives/old/8050/index.html
Tech information on floppy disks drives and media:
retrotechnology.com/herbs_stuff/drive.html
Timeline:
00:00 - Welcome
01:54 - Troubleshooting ideas
02:59 - Magnetic media info
05:09 - Digital PCB checks
08:48 - Analog PCB checks
11:27 - Lucky repair
12:12 - A less lucky 8250LP
Zaccaria Space Pirate repair video:
youtube.com/watch?v=buxrrfWE590
Cinematronics Star Castle original hardware video:
youtube.com/watch?v=qOFLaa3bmiU
Zaccaria Space Fortress video (in Italian):
youtube.com/watch?v=uH9Hf_Qg9Eo
My homemade vector monitor:
youtube.com/watch?v=nMicXIlprQs
Timeline:
00:00 - Welcome
00:40 - Space Pirate at home
01:16 - PCBs and EPROMs
05:05 - First power on
07:01 - Game "conversion" and inputs issue
09:11 - Final tests and some gameplay
Yaesu FT-817 service manual:
fracassi.net/iw2ntf/manuali/FT817_serv.pdf
Timeline:
00:00 - Welcome
00:37 - Opening it and inspection
01:32 - Battery fuse
02:38 - The green wire ghost
06:38 - Bad capacitors
08:32 - Broken trace
10:44 - Testing buttons
12:00 - A 6m QSO
My homemade vector monitor:
youtube.com/watch?v=nMicXIlprQs
Timeline:
00:00 - Welcome
01:12 - Logic PCB inspection
02:30 - Credits' PCB
08:37 - Logic PCB power on
13:08 - Audio/Video PCB inspection
14:08 - Using (and modding) my Vector monitor
16:10 - Audio dying saga
The first attempt showed some flaws that I try to correct with a second revision. The adapter uses two 5V supply, 32-cells CPLDs.
Many thanks to Gerrit Heitsch for providing scope captures of real 8501 signals and discussing the implementation details of these CPUs.
First part video:
youtube.com/watch?v=z5Evpt0pU9s
6510 to 7501/8501 adapter and kernel hack:
http://hackjunk.com/2017/06/23/commodore-16-plus-4-8501-to-6510-cpu-conversion
TED architecture documents:
http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/plus4/264_Hardware_Spec.pdf
http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/plus4/264_Hardware_Spec_DocE.jpg
MOS 7501 preliminary datasheet:
http://www.zimmers.net/anonftp/pub/cbm/documents/chipdata/7501/index.html
MOS 6510 datasheet:
http://archive.6502.org/datasheets/mos_6510_mpu.pdf
MOS 6502 datasheet:
http://archive.6502.org/datasheets/mos_6500_mpu_nov_1985.pdf
Atmel/Microchip PLD design resources:
microchip.com/design-centers/fpgas-and-plds/splds-cplds/pld-design-resources
DLC5 III parallel JTAG cable schematic:
http://dev.ivanov.eu/index.php?page=dlc5-jtag
UrJTAG for Linux:
http://urjtag.org
Timeline:
00:00 - Welcome
01:01 - First adapter was not good
02:37 - C16 upgrade to 64k
05:16 - C16 5V regulator upgrade
11:01 - CPU adapter design fixes
14:10 - New adapter's PCB
17:12 - Testing on the C16
23:49 - Other adapters?
25:09 - Running a plus4 demo
As bonus, we see how to find a good substitute for out of production PIN diodes and one way to measure the output power.
IC-E90 service manual:
http://www.radiomanual.info/schemi/ICOM_VU/IC-E90_serv.pdf
Timeline:
00:00 - Welcome
01:35 - Testing TX output
03:30 - Disassembly
05:01 - Possible faulty circuits
06:51 - PIN diode substitution
11:05 - Testing the repair
Zaccaria Astro Wars repair video:
youtube.com/watch?v=b4NDJMTLrw4
Zaccaria Galaxia #1 repair video:
youtube.com/watch?v=TVYFQGcRra4
Zaccaria Galaxia #2 repair video:
youtube.com/watch?v=2kPbGximviU
Zaccaria Galaxia #3 repair video:
youtube.com/watch?v=KPmJRj6f5oE
Diagnostic github repo:
github.com/iz8dwf/zaccaria-2650-diag
Timeline:
00:00 - Welcome
01:35 - EPROM/PROM checks
02:20 - Physical inspection
03:32 - Socket's nightmare
04:38 - Bad electrolytic
05:21 - First power-on
06:32 - BG RAM write fault
09:15 - Bad screen shifter
10:04 - Faulty starfield
10:50 - Bad Color RAMs
12:43 - The strange video bars
15:08 - Bad socket again
16:40 - Investigating the bad bombs
20:53 - Final checks
21:50 - The boards at home again
en.wikipedia.org/wiki/Thermophotovoltaic_energy_conversion
Music on this video:
Slow Times Over Here by Midnight North
the first Galaxia PCB revision. As usual, almost all of the sockets needed to be substituted.
The CPU reset circuitry needed an external 5V inputs, so I've jumpered this input directly on the PCB.
Also, this board had different "timing capacitors" than the other /1 boards I've serviced.
It seems it couldn't have worked in its current status.
Zaccaria Astro Wars repair video:
youtube.com/watch?v=b4NDJMTLrw4
Zaccaria Galaxia #1 repair video:
youtube.com/watch?v=TVYFQGcRra4
Zaccaria Galaxia #2 repair video:
youtube.com/watch?v=2kPbGximviU
Diagnostic github repo:
github.com/iz8dwf/zaccaria-2650-diag
Signetics 2650 CPU manual
http://datasheets.chipdb.org/Signetics/2650/2650UM.pdf
Timeline:
00:00 - Welcome
00:37 - Broken pins
04:42 - Other physical issues
08:15 - First power on
08:34 - Reset issue
11:49 - Bad sockets
13:46 - Bad PVI
15:05 - Timing madness
22:23 - Final tests
Music in this video:
Natural Light - Chris Haugen
Bright Skies - Audio Hertz
Commodore 64 tape adjustment program:
https://csdb.dk/release/?id=143459
Oscilloscope based adjustment procedure:
http://www.zimmers.net/anonftp/pub/cbm/schematics/datassette/datasette_schematic.pdf
A great video on this subject:
youtube.com/watch?v=2WrHqGm_LsA
help diagnosing these kind of arcade boards.
Zaccaria Astro Wars repair video:
youtube.com/watch?v=b4NDJMTLrw4
Zaccaria Galaxia #1 repair video:
youtube.com/watch?v=TVYFQGcRra4
Diagnostic github repo:
github.com/iz8dwf/zaccaria-2650-diag
Signetics 2650 CPU manual
http://datasheets.chipdb.org/Signetics/2650/2650UM.pdf
The macro assembler "AS"
http://john.ccac.rwth-aachen.de:8000/as/
DASMx disassembler
oocities.org/pclareuk/DASMx
Timeline:
00:00 - Welcome
00:32 - Physical inspection
01:03 - First power on
02:13 - Socket's nightmare
05:34 - Bad 74LS139
06:50 - First bad 2102
08:58 - Bad PVIs
10:10 - First bad 2x2114
12:48 - I need Diag ROM!
15:36 - Another bad 2x2114
17:19 - Another bad 2102
17:54 - Bad screen shifter
19:28 - Bad 2101
22:00 - Final tests
PCB and its sound board. The original faults were a bad 74S112 and a bad 74LS173 but other ICs failed during the repair of the previous faults.
Online romident:
http://romident.coinopflorida.com
Zaccaria Astro Wars repair video:
youtube.com/watch?v=b4NDJMTLrw4
Zaccaria arcade information and repair website
http://www.zzzaccaria.com/zzz/welcome.html
Timeline:
00:00 - Welcome
01:05 - Physical inspection
02:56 - EPROMs checks
05:04 - Power ON
05:56 - Missing clock
07:20 - Starfield issues
11:28 - Bad TTL latch
14:05 - Bad color RAM
14:44 - First inputs check
15:54 - 74LS283 fails
21:31 - 74LS155 fails
26:23 - Sound PCB fix & test
Zaccaria arcade information and repair website
http://www.zzzaccaria.com/zzz/welcome.html
Zaccaria Astro Wars real cabinet play
youtube.com/watch?v=eSrQFBMeDlM
Timeline:
00:00 - Welcome
00:46 - Physical inspection
02:31 - EPROMs check & MAME
04:31 - Video and power wiring
06:40 - S2650 CPU checks
08:50 - The wrong ICs
12:32 - Game booting & checks
16:07 - Sound PCB check
17:35 - RGB inverter circuit
Music in this video:
Icelandic Arpeggios - DivKid
No.10 A New Beginning - Esther Abrami
Everything Has a Beginning - Joel Cummins
board have been reworked previously, but there were still issues with
a couple of Motorola 74LS244 ICs.
Atari Missile Command service manual:
arcade-museum.com/manuals-videogames/M/MissileCommand.pdf
Board #1 repair video:
youtube.com/watch?v=DmbbRx8pIHc
Timeline:
00:00 - Welcome
00:36 - Physical inspection
03:02 - Refreshing tin layer on power pins
03:50 - CPU checks
04:30 - First databus shorted line
07:40 - Second databus shorted line
10:45 - Final tests
some mistakes during troubleshooting, but in the end the board was completely functional. No ICs needed substitution, all faults were solder/mechanical issues.
Atari Missile Command service manual:
arcade-museum.com/manuals-videogames/M/MissileCommand.pdf
DRAM in-circuit comparator:
youtube.com/watch?v=xRQRTc4lDlg
youtu.be/U0985Padg6c
Second Missile Attack game board repair video:
youtube.com/watch?v=EF3GC0jiFw8
Timeline:
00:00 - Welcome
00:21 - Bootleg introduction
02:02 - Physical inspection
04:22 - NOP generator checks
06:29 - Troubleshooting mistake n.1
08:17 - A custom test ROM
09:54 - Troubleshooting mistake n.2
11:02 - Finding a short circuit
14:51 - Video output
16:21 - Testing the trackball circuit
ebay. Unfortunately I've discovered it had a few missing parts (and not so
easy to find ones).
In this video I try restoring at least all functionalities, so in the future I can
attempt to calibrate it and see if it still met its specifications.
Solartron 7151 manuals:
http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Solartron/Solartron_7151_Computing_Multimeter
GPIB to USB converter project:
http://www.dalton.ax/gpib/
Timeline:
00:00 - Welcome
00:24 - External inspection
01:26 - Instrument features
02:15 - Internal inspection
03:31 - Battery damage
04:12 - First power-on
05:08 - Shorted capacitor
07:46 - The missing parts
11:02 - Bringing it back to life
18:10 - Improving the backlight
19:13 - Testing the GPIB interface
Timeline:
00:00 - Welcome
00:17 - Board inspection
00:56 - Schematics explained
04:48 - Calculating a working test load
06:32 - Testing the outputs
video shows all the troubleshooting of the CPU and Video PCBs. In this repair I've encountered a very unusual fault in my experience.
In the previous video, I've shown my own syncbus daughterboard replacement with a ATF1502 CPLD using CUPL language.
Timeline:
00:00 - Welcome
00:55 - UP8 failure
04:04 - UL8 failure
06:58 - UA1 failure
08:35 - UF9 failure
10:03 - Bad 2114 on Video UM6
11:15 - UJ7 failure
14:18 - "bad sprites"
14:50 - UA8 failure
16:15 - bad sprites fix (video UA2)
17:30 - really weird timing race
First video of this repair:
youtube.com/watch?v=VK13G8KH0y8
Timeline:
00:00 - Welcome
00:38 - Board inspection
01:34 - New daughterboard design
04:02 - First revision doesn't work
04:56 - Correcting my CUPL mistakes
07:47 - Daughterboard working
Second part of this repair:
youtu.be/8aQs6MMEITA
Daughterboard github repository:
github.com/iz8dwf/gallag-daughterboard
Testing (almost?) all connections around the damaged area, adding parts
and wires to restore full functionality. The clock oscillator drifted out of
frequency enough to bring the NTSC colour carrier out of the detection
range.
Timeline:
00:00 - Welcome
00:19 - Assessing damages
01:20 - Restoring connections
04:20 - Missing video sync
05:51 - ADB port fault
08:05 - Get the colors back
12:54 - Drifted oscillator
Apple IIgs schematics:
applefritter.com/files/2021/03/18/Apple%20IIgs%20schematic.pdf
Music in this video:
Lilac Skies - Corbyn Kites
Accidents Will Happen - Silent Partner
This last part covers the cathode amplifier (Z amplifier) circuit and the spot killer circuit.
Last modifications and tuning of the other part of the circuits are also shown whenever they became necessary.
Timeline:
00:00 - Welcome
01:37 - Metal chassis
02:20 - Cathode amplifier
13:07 - It lives!
14:27 - Spot killer
19:37 - Linearity & geometry
27:36 - Final result
First part (how it all started and some theory about raster scan VS vector scan):
youtu.be/-o5zJ1T778g
Second part (how can an ex-raster flyback be used without the old horizontal deflection circuit)
youtu.be/5PQaKYQ3CRA
Third part: (complete CRT power supply)
youtu.be/PKXyUhuLZUM
Fourth part: (deflection amplifier & deflection yoke rewind)
youtube.com/watch?v=xNVZ1HK8R1w
A28-14W CRT datasheet:
frank.pocnet.net/sheets/124/a/A28-14W.pdf
Rewinding the vertical coils on a yoke:
youtube.com/watch?v=Ci9qiGVMF7s
Jürgen Müller X/Y deflection board and Asteroids pages:
http://www.e-basteln.de/arcade/asteroids/intro/
1943 Navy: The Cathode-Ray Tube educational
youtube.com/watch?v=-Uh7XuM1eUA
Raster scan (wikipedia):
en.wikipedia.org/wiki/Raster_scan
TV and monitor deflection systems:
http://repairfaq.cis.upenn.edu/sam/deflfaq.htm
The Secret Life of Vector Monitors:
http://www.jmargolin.com/xy/xymon.htm
Electrohome G05-801 XY monitor information:
http://www.amazingarcading.com.au/G05-801_Dezbaz.htm
Vectrex game console:
it.wikipedia.org/wiki/Vectrex
Information about arcade vector monitors:
http://www.andysarcade.de/vec_monitors.html
Atari Asteroids arcade information:
http://www.andysarcade.de/asteroids.html
The Secret Life of Vector Generators:
http://www.jmargolin.com/vgens/vgens.htm
#Shorts
Timeline:
00:00 - Welcome
01:08 - Schematic description
03:53 - Initial checks
06:10 - Light bulb help
08:11 - One bad transformer
11:04 - 2nd chassis repair
12:38 - Testing the EHT diode
13:46 - Adding an external diode
17:18 - Testing with the real game
19:18 - Final diode replacement
Hantarex MTRV manual:
https://usermanual.wiki/Document/HantarexMTRV.2796494215
Hyperspace arcade:
http://www.andysarcade.de/hyperspace.html
arcade-museum.com/game_detail.php?game_id=18827
Timeline:
00:00 - Welcome
00:28 - IWM troubleshooting
02:54 - IWM "options"
06:34 - Final tests
Apple IIgs schematics:
applefritter.com/files/2021/03/18/Apple%20IIgs%20schematic.pdf
Apple IWM documentation
https://brutaldeluxe.fr/documentation/iwm.html
Timeline:
00:00 - Welcome
00:30 - Apple IIgs introduction
02:02 - Custom ICs
03:31 - Troubleshooting
09:07 - Final tests
Apple IIgs schematics:
applefritter.com/files/2021/03/18/Apple%20IIgs%20schematic.pdf
In this second video we'll see the troubleshooting and repair of the multi-band PLL circuits.
First part video:
youtube.com/watch?v=ZSsBRalmUaY
Timeline:
00:00 - Welcome
00:57 - PLL dividers issue
12:14 - PLL BP filters issue
16:14 - Final checks
Second part of the complete repair, more socket-rework-induced faults and a few bad 4116 ICs.
Timeline:
00:00 - Welcome
00:38 - A missing GND to TTL chip
01:51 - The DRAM tester strikes again
02:51 - Another missing connection
03:55 - DRAM tester magic again
05:07 - Keyboard interface issue
06:02 - Another bad 4116
09:01 - 32Kbytes and test time
12:05 - The last broken trace
Part 1 video:
youtube.com/watch?v=vZ5CVQRKW-k
Related/useful videos:
How to test a remarked 6502:
youtube.com/watch?v=5MccK9MI9qI&t=272s
IZ8DWF's PET RAM/ROM daughterboard:
youtube.com/watch?v=bjyGk5zoDMs
IZ8DWF's dynamic RAM in-circuit tester:
youtube.com/watch?v=xRQRTc4lDlg&t=430s
Music on this video:
Well Worth the Wait - Silent Partner
First part of the complete repair after it was almost completely socketed.
Timeline:
00:00 - Welcome
00:34 - Sockets! They're everywhere!
02:00 - Testing all RAM connections
05:36 - Power on tests
06:18 - All 40 pins IC are bad
08:33 - Half of the ROMs are bad
11:39 - Missing trace to one ROM
13:06 - The first bad 4116
14:41 - A long RAM troubleshooting
15:06 - Bad /RAS
17:40 - Identifying a short circuit
21:33 - More fixes to go.
Second part video:
youtu.be/U0985Padg6c
Related/useful videos:
How to test a remarked 6502:
youtube.com/watch?v=5MccK9MI9qI&t=272s
IZ8DWF's PET RAM/ROM daughterboard:
youtube.com/watch?v=bjyGk5zoDMs
IZ8DWF's dynamic RAM in-circuit tester:
youtube.com/watch?v=xRQRTc4lDlg&t=430s
Music on this video:
Wise - Silent Partner
Natural - Endless Love
Cologne 1983 - Josh Kirsch/Media Right Productions
In this first video we'll see how to approach such a repair and how to test and repair the voltage regulator board (AVR) of this old radio.
Second part video:
youtu.be/K5wD9Gww_1c
Timeline:
00:00 - Welcome
01:27 - TS-180S introduction
02:14 - Power on and symptoms
03:33 - Troubleshooting approach
05:00 - 8V regulator troubles
12:56 - Minus 6V regulator troubles
Faults found:
- NE555 on reset circuit
- M53354 TTL decoder IC
- 2 x MOS6520 PIA
- 2 x MOS masked programmed ROMs
- HM4716AP DRAM IC
Timeline:
00:00 - Welcome
00:42 - Mechanical issues
01:16 - Voltage checks
01:43 - CPU reset missing
04:07 - Address decoder fault
09:03 - First bad ROM
10:21 - First bad MOS6520
13:15 - Second bad ROM
17:41 - It lives! (w/ a bad 6520)
20:38 - Fixing IEEE-488
22:26 - Bad RAM IC
PET RAM/ROM daughterboard:
youtube.com/watch?v=bjyGk5zoDMs
8-bit NOP generator introduction:
youtu.be/9Ms6QR4r93I
Mr. Li's 6502 NOP generator socket:
laser.com/product_info.php/item/6502NOP-6502NOP_Chip/products_id/1981
Re-tinning edge connectors:
youtu.be/D3pSjQLOlrc?t=926
Re-tinning faster method:
youtu.be/IHRH3E0EtLg?t=1682
Music on this video:
Guava Juice by Aaron Lieberman
Faults found:
- CR4 bridge rectifier
- 5 x TMM416P-3
I succesfully made a test tool to help identifying bad DRAM chips in circuit, if absolutely sure that all the rest of a machine is working fine.
Timeline:
00:00 - Welcome
00:55 - Checking the rectifiers
03:17 - First checks at power on
04:11 - Troubleshooting with Ram/Rom board
07:10 - The in-circuit DRAM comparator
10:35 - Finding more bad chips with BASIC
12:55 - Final testing of all ports
PET RAM/ROM daughterboard:
youtube.com/watch?v=bjyGk5zoDMs
Universal PET repair and "A7 ADDR BAD" error:
youtube.com/watch?v=PTKSLsCMRos
Re-tinning edge connectors:
youtu.be/D3pSjQLOlrc?t=926
Re-tinning faster method:
youtu.be/IHRH3E0EtLg?t=1682
Music on this video:
Bright Idea by Geographer
I've got also a few spare quartz crystals and I show a simple circuit to quickly test them.
C64 SID tester:
https://commodore.software/downloads/download/148-c64-testers/11835-commodore-64-sid-tester
SID tester video:
youtube.com/watch?v=IjlQsqx3_LA
Music in this video:
Cologne 1983 by Josh Kirsch/Media Right Productions
Lunatico by LFT:
https://csdb.dk/release/?id=151273
Timeline:
00:00 - Welcome
02:30 - 27C512 EPROMS
03:09 - Checking Temic PLS100 ICs
06:37 - Checking ICT PEEL ICs
08:07 - A Circuit for testing crystals
10:25 - Checking the MOS8701 ICs
11:21 - All SIDs tests
18:15 - Rev. A C64 complete
This is the complete repair process of one of my Atari Asteroids Arcade PCBs.
Faults fixed:
1) X deflection missing due to bad AD561 IC
2) The previous "repair" person attempted to permanently kill the board with the help of a soldering iron (cut trace under a replaced IC, caused a fault in the vector generator state machine).
3) Rev -02 board had a mistake in the "thump" sound generator.
Timeline:
00:00 - Welcome
01:35 - First power on
02:21 - Troubleshooting the X output
05:05 - Vector generator issues
09:04 - Thump sound issues
11:36 - Rev -02 PCB errata
Related videos:
first inspection and repairs of my Asteroids PCBs:
youtube.com/watch?v=IHRH3E0EtLg
Making a power supply and audio power amplifier for Atari Asteroids:
youtu.be/35YR62yv3-E
Great video about Atari XY arcade vector generators
youtube.com/watch?v=smStEPSRKBs
Atari Asteroids related information:
en.wikipedia.org/wiki/Asteroids_(video_game)
http://www.andysarcade.de/asteroids.html
arcade-museum.com/game_detail.php?game_id=6939
http://www.jmargolin.com/vgens/vgens.htm
This is the complete repair process of one of my Atari Asteroids Arcade PCBs.
Faults fixed:
1) A double-IC shorted /RESET line.
2) The previous "repair" person attempted to permanently kill the board with the help of a soldering iron
3) Some 6502 seems not really suited for the Asteroids game board.
Timeline:
00:00 - Welcome
01:42 - First power on
02:23 - CPU's Reset problem
07:47 - The shacking vectors disease
08:16 - Poor soldering job disease
10:22 - Not all 6502s are made equal
13:40 - Last checks
Related videos:
first inspection and repairs of my Asteroids PCBs:
youtube.com/watch?v=IHRH3E0EtLg
Making a power supply and audio power amplifier for Atari Asteroids:
youtu.be/35YR62yv3-E
Atari Asteroids related information:
en.wikipedia.org/wiki/Asteroids_(video_game)
http://www.andysarcade.de/asteroids.html
arcade-museum.com/game_detail.php?game_id=6939
http://www.jmargolin.com/vgens/vgens.htm
that's perfect for my Rev. A C64 PCB!
A quick look at the somewhat rare 24 pins 8 kBytes eprom MCM68766.
A few tests to determine what a "rebadged" or "remarked" 6502 from China can be.
Timeline:
00:00 - Welcome
01:17 - MCM68766 EPROMS
02:57 - Reading the 82S100 C64 PLA
04:32 - A few checks on unknown 6502 chips
IZ8DWF's 82S100 PLA video
youtube.com/watch?v=nicaN-IdzNI
65C02 opcodes:
http://6502.org/tutorials/65c02opcodes.html
6502's wikipedia page:
en.wikipedia.org/wikien.wikipedia.org/wiki/MOS_Technology_6502
The CMOS 6502 from Byte Magazine Dec. 1983:
http://archive.6502.org/appnotes/the_cmos_6502.pdf
6502 functional tests code:
github.com/Klaus2m5/6502_65C02_functional_tests
This is the second part in my Atari Asteroids Arcade project.
I needed to make a complete power supply for the game PCB (and the
vector monitor) and an audio power amplifier with a balanced input.
Timeline:
00:00 - Welcome
01:47 - Power supply
07:39 - Audio amplifier
12:23 - Oscilloscope as XY display
Related videos:
first inspection and repairs of Asteroids PCBs:
youtube.com/watch?v=IHRH3E0EtLg
first video (of several ones) about making a CRT vector monitor:
youtube.com/watch?v=-o5zJ1T778g
Atari Asteroids links:
en.wikipedia.org/wiki/Asteroids_(video_game)
http://www.andysarcade.de/asteroids.html
arcade-museum.com/game_detail.php?game_id=6939
http://www.jmargolin.com/vgens/vgens.htm
This is the fourth video about the construction of a complete 11" CRT
monitor suitable for X-Y vector deflection of an Atari Asteroids arcade
PCB.
Exploring the X-Y deflection issues on both adapting a yoke meant for
raster deflection and making a good driver circuit for it.
First part (how it all started and some theory about raster scan VS vector scan):
youtu.be/-o5zJ1T778g
Second part (how can an ex-raster flyback be used without the old horizontal deflection circuit)
youtu.be/5PQaKYQ3CRA
Third part: (complete CRT power supply)
youtu.be/PKXyUhuLZUM
Fifth part: (Z-amp, spot killer, final tuning)
youtu.be/nMicXIlprQs
A28-14W CRT datasheet:
frank.pocnet.net/sheets/124/a/A28-14W.pdf
Rewinding the vertical coils on a yoke:
youtube.com/watch?v=Ci9qiGVMF7s
Jürgen Müller X/Y deflection board and Asteroids pages:
http://www.e-basteln.de/arcade/asteroids/intro/
1943 Navy: The Cathode-Ray Tube educational
youtube.com/watch?v=-Uh7XuM1eUA
Raster scan (wikipedia):
en.wikipedia.org/wiki/Raster_scan
Electrohome G05-801 XY monitor information:
http://www.amazingarcading.com.au/G05-801_Dezbaz.htm
Vectrex game console:
it.wikipedia.org/wiki/Vectrex
Information about arcade vector monitors:
http://www.andysarcade.de/vec_monitors.html
Atari Asteroids arcade information:
http://www.andysarcade.de/asteroids.html
The Secret Life of Vector Generators:
http://www.jmargolin.com/vgens/vgens.htm
The Secret Life of Vector Monitors:
http://www.jmargolin.com/xy/xymon.htm
vector XY monitor for my Atari Asteroids PCB.
All the CRT power supply is described and I show the first XY deflection tests.
First part (how it all started and some theory about raster scan VS vector scan):
youtu.be/-o5zJ1T778g
Second part (how can an ex-raster flyback be used without the old horizontal deflection circuit)
youtu.be/5PQaKYQ3CRA
Fourth part (Deflection and yoke):
youtu.be/xNVZ1HK8R1w
Fifth part: (Z-amp, spot killer, final tuning)
youtu.be/nMicXIlprQs
A28-14W CRT datasheet:
frank.pocnet.net/sheets/124/a/A28-14W.pdf
Electrohome G05-801 XY monitor information:
http://www.amazingarcading.com.au/G05-801_Dezbaz.htm
Vectrex game console:
en.wikipedia.org/wiki/Vectrex
Using a Vectrex XY monitor with Atari Asteroids:
http://www.e-basteln.de/arcade/asteroids/monitor/