Different ROMs for Lambda 8300

[mrtinb]

These are the ROMs for Lambda hardware I have found on Internet

• Original Lambda 8300 ROM
  • Lambda 8300 LAM10061.BIN
    
    Additional commands to ZX81:
    • BEEP
    • NOBEEP
    • SOUND
    • TEMPO
    • MUSIC
• Updated Lambda 8300 ROM with color support
  • Lambda 8300.rom
  • Power 3000 ROM with colour kit commands.rom
  • Marathon 32 MAR14348.BIN
  • Lambda.rom in EightyOne
    
    Additional commands to original Lambda 8300:
    • INK
    • PAPER
    • BORDER
• CAC-3 ROM
  • cac-3.rom
    
    Additional commands to Updated Lambda 8300 ROM with color support:
    • READ
    • DATA
    • RESTORE
• NF300 ROM
  • NF300.ROM
    
    Additional commands to Updated Lambda 8300 ROM with color support:
    • READ
    • DATA
    • RESTORE
• ZX81 compatible ROM for Lambda 8300
  • Power 3000.rom
  • Lambda 8300 ROM modified ZX81 compatible.rom
  • 8300.rom in EightyOne
    
    Additional commands to ZX81:
    • BEEP
    • IN
    • OUT

[David G]

Changes in RED (updated list)

These are the ROMs for Lambda hardware I have found on Internet

• Original Lambda 8300 ROM
  • Lambda 8300 LAM10061.BIN
    
    Additional commands to ZX81:
    • BEEP
    • NOBEEP
    • SOUND
    • TEMPO
    • MUSIC
• Updated Lambda 8300 ROM with color support (all files same byte-for-byte)
  • Lambda 8300.rom
  • Power 3000 ROM with colour kit commands.rom
  • Marathon 32 MAR14348.BIN (no longer available for checking)
  • Lambda.rom in EightyOne
  • embedded in NO$ZX 2.0 emulator
    
    Additional commands to original Lambda 8300:
    • INK
    • PAPER
    • BORDER
• CAC-3 ROM
  • cac-3.rom (8EEC1EC6-cac-3.rom)
    
    Additional commands to Updated Lambda 8300 ROM with color support:
    • READ
    • DATA
    • RESTORE
• NF300 ROM
  • NF300.ROM (F8BBA9D8-NF300.ROM)
    
    Additional commands to Updated Lambda 8300 ROM with color support:
    • READ
    • DATA
    • RESTORE
• ZX81 compatible ROM for Lambda 8300 (all files same)
  • Power 3000.rom
  • Lambda 8300 ROM modified ZX81 compatible.rom
  • 8300.rom in EightyOne
    
    Additional commands to ZX81:
    • BEEP
    • IN
    • OUT

[mrtinb]

I know the files are the same. I was trying to tell, that the same ROM had different names. Somehow I wasn’t clear.

[frankc64]

Hello!
New on this list, as I just acquired a Lambda 8300.
I need to replace the ROM in a Lambda 8300. I tried to download the Lambda 8300 ROM LAM10061.BIN, but the link seems to be broken. Does anyone here have the ROM binary.

Best
Frank

[mrtinb]

http://web.archive.org/web/201612200322 ... M10061.BIN

As the Lambda 8300 uses masked ROM, you'll not be able to replace it with an EPROM or EEPROM without an adapter.

[frankc64]

Thanks!
Well, I guess that there is info about EPROM adaptors to be found on the web.
In the meantime I've come to suspect that my issue really has more to do with the 74LS05, as it looks like the data bus lines behave weird, while the address lines look normal.
/Frank

[1024MAK]

It has to be said, mask ROM chips can occasionally fail, but most are fairly reliable. So it’s definitely worthwhile double checking and investigating other possible problems.

Mark

[mrtinb]

In the design of the ZX81 (which Lambda 8300 is a clone of), the ULA (glue logic IC) overrides data from for the CPU on the data bus. So the data bus signals does not look normal. However the signals are within specification to work.

This is explained in this video @6:30+ https://youtu.be/N9wEcpF-9-c

[frankc64]

Signal should be over 4V peak-to-peak, and that is the case on the address bus, but on the data bus they are less than 2V. That cannot be right.

/Frank

[mrtinb]

I'm not an expert in electronics. The construction with the 74LS05 is different from the ZX81. My guess is that the 74LS05 is used to feed the NOP instruction into the data bus from the ULA. That might be wrong, as that would conflict always on the databus, as there is no resistors between the 75LS05 and databus towards the CPU.