glitch
Veteran Member
Finally got a prototype for the Motorola 6830 replacement done:
The above image shows the prototype lashed up to a Glitchbus 32K RAM board for testing. Closeup:
The MC6830 is a mask ROM which was used in a number of Motorola 6800 systems, such as the MEK6800D1 and D2 trainers/dev boards, SWTPC 6800, etc. Not only is it mask programmable, but the chip select polarities are also mask programmable. That means that a universal replacement must have selectable polarity too, which we've done using surface mount 0R jumper resistors. Since we ended up using an 8K EEPROM, there's an optional rotary switch included, which allows selecting the ROM image you want to be active. Handy for e.g. having MIKBUG and JBUG both available on your MEK6800D2, having a ROM-resident memory test for your SWTPC 6800, or just making custom ROM images available with stock images!
Here are some closups of just the module:
The flywires will be replaced with a pogo pin test fixture, which we haven't designed yet. The rotary switch used in the prototype is a through-hole version, since the J-lead surface mount version is currently on a long backorder. It's an expensive part -- around $8 in QTY 1 -- so it's optional for the GW-6830-1 if you only want a single ROM image.
The above image shows the prototype lashed up to a Glitchbus 32K RAM board for testing. Closeup:
The MC6830 is a mask ROM which was used in a number of Motorola 6800 systems, such as the MEK6800D1 and D2 trainers/dev boards, SWTPC 6800, etc. Not only is it mask programmable, but the chip select polarities are also mask programmable. That means that a universal replacement must have selectable polarity too, which we've done using surface mount 0R jumper resistors. Since we ended up using an 8K EEPROM, there's an optional rotary switch included, which allows selecting the ROM image you want to be active. Handy for e.g. having MIKBUG and JBUG both available on your MEK6800D2, having a ROM-resident memory test for your SWTPC 6800, or just making custom ROM images available with stock images!
Here are some closups of just the module:
The flywires will be replaced with a pogo pin test fixture, which we haven't designed yet. The rotary switch used in the prototype is a through-hole version, since the J-lead surface mount version is currently on a long backorder. It's an expensive part -- around $8 in QTY 1 -- so it's optional for the GW-6830-1 if you only want a single ROM image.