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PET Diagnostics - Upcoming Project Preview Vintage Computer Repairs Contact This Is a Preview of an Upcoming Project Tynemouth Software LLP - Old computers, New computers, Bespoke Web Design and Software Development, Computer repairs, IT and Media Services - www.tynemouthsoftware.co.uk Saturday, 30 April 2016 Tynemouth Softw are Links Tynemouth Software Shop PET Diagnostics - Upcoming Project Preview Vintage Computer Repairs Contact This is a preview of an upcoming project. Not sure if the name will stick, but at the moment it's called PET Exerciser (UPDATE: it didn't, it's now called 6502 Diagnostics). This started when I was repairing a few Twitter PETs and was using a NOP generator. This idea of these is the hard wire the NOP instruction onto the processor databus, the end result of that is it just steps through all the addresses sequentially, Support This Blog continually. That is useful to check address decoding, and see if chip enable pins are pulsing in the right way. The trouble is the 1MHz 6502 based NOP generator is a bit slow to check high address bits on a Donate via Patreon scope (at least one without digital storage), but too fast to check by eye. Donate via PayPal Buy something from my shop Etsy Store Tindie Store TFW8B Store Send me something interesting to repair / review / reuse / recycle Search This Blog Search Blog Archive I got to thinking, could I adjust the clock rate fed to the 6502 to get the pulses into a more usable range? ► 2017 (13) Before I started looking at that, I thought that it would be easier to just bypass the 6502 all together and ▼ 2016 (54) use a couple of 8 bit counters to cycle through all the address bus at whatever speed I chose. I did look ► December (3) at a few options for that, but it was going to be a bit messy as it would have ended up with 4 x 4 bit ► November (7) counters and a pulse generator, which was maybe going to be an 8 pin microcontroller. I then thought I could just use a microcontroller. And lo the PET exerciser diagnostics was born. ► October (4) ► September (2) ► August (6) ► July (4) ► June (3) ► May (9) ▼ April (4) PET Diagnostics - Upcoming Project Preview Acorn A3000 USB keyboard Sony HB75-P MSX USB keyboard with USB joystick Nissan Leaf - Three Years On I then got to thinking, if I had a few more pins on the microcontroller, I could access the databus and some of the control signals as well. Hmm. interesting. The prototype doesn't look as neat as that final ► March (5) PCB will. ► February (5) ► January (2) ► 2015 (79) ► 2014 (58) ► 2013 (44) ► 2012 (29) ► 2011 (5) ► 2010 (7) Labels Commodore (114) Under that mass of wires is a Commodore PET, and on the breadboard is a micrcontroller, the DIP Repair (78) USB version of the one I will use on the final board. The microcontroller is connected to most of the pins in the Pet (55) 6502 socket. There isn't an actual 6502 involved any more. Before I got around to writing the code for the Keyboards (71) Vintage (50) Hardware (42) NOP generator. I was interested to see if I could actually drive the PET hardware to do anything Raspberry Pi (29) ZX Spectrum interesting. (29) 4032 (28) Arduino (28) VIC20 (27) AdventCalendar (25) Sinclair (25) ZX81 (24) C64 (22) 8032 (20) Review (19) Etsy (18) USB Joystick (17) PenultimateCartridge (15) Restoration (15) USB (15) pet microSD (13) Atari (11) IEEE-488 (10) BBC (9) Spectrum (9) Vinatge (9) ZX80 (9) 6502 (8) Electric Vehicles (8) Nissan Leaf (8) C128 (7) Electron (7) Rant (7) ZX81 Clone (7) 2001 (6) Acorn (6) Car (6) Keyboard (6) LED Clock (6) SD card (6) TVOut (6) Website Design (6) C16 (5) Diagnostics (5) Library (5) PET diagnostics (5) 8032-SK (4) Composite Video Mod (4) Data Recovery (4) Disk Drive (4) HTPC (4) Minstrel (4) PSU (4) Teardow n (4) ZX Spectrum Plus (4) 2600 This is the first test was a screen of incrementing characters, but as I got the hang of writing the PET (3) 3032 (3) 6502 diagnostics (3) 65XE video RAM, that quickly grew into a character table. If nothing else than to help me work out what (3) 8250 (3) DivMMC (3) GPIB (3) IBM characters to write the the video RAM to show on the screen - it's PETSCII, not ASCII. Since I can now 5160 (3) LCD Clock (3) Laptop (3) write to RAM, I can also poke things, and one useful poke on the PET is to change character sets from Preview (3) QL (3) SID (3) ST (3) TFW8B business mode (with uppercase and lowercase letters) to graphics mode (without lowercase but more (3) Toastrack (3) Upgrade (3) 1541 (2) symbols. This sets CA2 on the VIA which controls the high address line on the character ROM. 800XL (2) A3000 (2) A500 (2) A500+ (2) Amiga (2) Amstrad (2) CPC464 (2) Custom PC (2) Gate of India (2) I2C (2) ICL OPD (2) Ikea (2) MITx (2) Oric (2) Oric-1 (2) PET LCD (2) Pi Zero (2) Plus4 (2) Refurbished PCs (2) SATA (2) TI99/4A (2) Virus Scan (2) Z80 (2) ZX Spectrum +2 (2) 128K (1) 1571 (1) 3D Printing (1) 400 (1) 6530 (1) 8096 (1) Amazon (1) Android (1) Apple. (1) CP/M (1) CPC6128 (1) Chromecast (1) Colecovision (1) DL Mole (1) Datasette (1) Doctor Who (1) Google (1) Harlequin (1) IBM (1) LIRC (1) Logo Design (1) MSX (1) Microdrive (1) Model M (1) MythTV (1) Netflix (1) News (1) Nintendo (1) OUYA (1) PET exerciser (1) PIC (1) PLA Replacement (1) PS2 (1) Here you can see the PET board I was testing has a faulty character ROM, some of the symbols are not PartialSuccess (1) Phone (1) Power Supply displaying correctly in graphics mode. OK, this is proving rather interesting and should be very useful. (1) RISC OS (1) ROMRAM (1) RS232 (1) What next? Well, let's test the RAM. I'm currently working on a 2001 board, so I've only set it to test the Restoration. (1) SNES (1) Spanish (1) first 8K. I've split it into 1K blocks and tested by bit to help narrow down the faults. Subversion (1) TRS80 (1) TS1000 (1) Transfer (1) USB Mice (1) Windows 10 (1) Windows 8 (1) eMac (1) ebay (1) petSD+ (1) Google+ Follow ers Dave Curran Add to circles The test algorithm I'm using is fairly simple, I'm just poking various values and reading back. I'm recording any bits that are different from the values written, and here it has picked up 2 errors on one RAM chip. This matches what BASIC was showing when the PET was running, it only detected the first 1K of RAM, so was showing around 800 bytes free. I've removed the chip I think it is, and retested. 83 have me in circles View all Tynemouth Softw are Etsy Store Good, it's showing 400 errors (that's 400 hex, 1024 decimal), all in the lower nibble, which is exactly the ZX Spectrum USB Keyboard Conversion kit area served by the 2114 chip removed. I tried to lay the screen out to match the orientation of the chips, so the second row of 2114 chips, right hand side is the culprit. ZX Spectrum Plus USB Keyboard Conversion kit USB joystick adapter for 9 pin D Commodore / Atari style Joysticks I replaced the chip and retested and it's now fine, and when I return this to 6502 control, it should detect all 8K of RAM again. The TMS2114L-20NL I have used there isn't an exact replacement for the TMS4045- 45NL, but is enough to prove the point whilst I try to locate something better. I'll probably use one of the pair that are the video RAM, and replace both of those with faster 2114 chips. Sinclair ZX81 USB Keyboard Raspberry Pi inside Sinclair ZX81 USB Keyboard You can see where I was also starting to test the ROMs. I've gone for a simple 16 bit checksum of the ROMs, and that seems to be working consistently. I've added a lookup table of CRC codes with descriptions for known good ROMs. I've got it plugged into one of my 6502 ROM/RAM boards for testing, so I have been able to get CRCs for most of the standard ROM sets already. This is a good way to identify faulty ROMs. Sinclair ZX Spectrum USB Keyboard Raspberry Pi inside Sinclair ZX Spectrum USB Keyboard Here some of the 6540 ROM chips are working (I've given the chip numbers of the good ones), but the others are coming back with different CRCs. The CRCs have also changed on those as I have repeated the test, so I guess they are faulty, or since it is only the x000 ones that are working, there may be a problem with the BA11 line that controls the x800 ones. More testing required. Sinclair ZX Spectrum Plus USB Keyboard Raspberry Pi inside Sinclair ZX Spectrum Plus USB Keyboard I've added in a test for video RAM before the screen is drawn, and inserted the results into the memory map. I'm testing the full 2K region, but the second 1K is a mirror of the first, apart from 80 column systems. I've also expanded the address ranges to test the 32K and 4K ROM sets on a 4032 system. These two modes may be a different build, jumper selectable, or maybe by a menu? Sinclair ZX Spectrum + 2 USB Keyboard Commodore VIC 20 USB Keyboard £99.00 I'm getting a bit carried away, there are so many possibilities here, and I think this is going to turn into a very useful piece of kit.
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