General Category > Lisa Troubleshooting and Repair
M0130
blusnowkitty:
And I use a Willem Programmer because I have no shortage of PCs with real parallel ports. I think just about any programmer made in the last 40 years should be able to program a 2716/2732; they only made a few trillion of those chips...
paule:
My understanding is that there is one subtle difference between the Lisa 400K drive and the Mac 400K drive. That is the behavior on system reset (IIRC) when the Lisa drive will eject any disk in the drive and the Mac 400K drive won't. I'm trying to remember where I found that information...
andrew:
A couple questions:
Instead of wiping the working ROM that I have (because I've never actually done this before), can I buy and flash a blank chip instead? If so, is there a part number I can google for the ROM chip?
Also, I picked up an 800K drive cage but there isn't enough clearance between it and my vertically mounted X-Profile. Is there a supported way to install it horizontally like the original widget drive? I don't think the LED will be aligned properly, but I'm not terribly concerned about that.
blusnowkitty:
--- Quote from: andrew on March 02, 2023, 08:52:57 am ---A couple questions:
Instead of wiping the working ROM that I have (because I've never actually done this before), can I buy and flash a blank chip instead? If so, is there a part number I can google for the ROM chip?
--- End quote ---
It'll either be a 2716 or a 2732, I don't remember which but peel up the label and it should tell you. the 27Cxx variants should also be fine.
To wipe a EEPROM, you'll need to grab an eraser box, which is just a UV-C lamp in a sealed box and these can still be had for very cheap. Peel up the label, clean up adhesive residue with isopropyl, and set it in the box for 30-45 minutes, and the ROM is blank. I don't think anyone makes brand new 27xx chips anymore so you'll be buying used or NOS parts. Even in the case of NOS parts, I'd still wipe the chips first just in case cosmic radiation or something flipped a bit in the chip. Even one bit that isn't erased is enough to cause a ROM programming to fail.
sigma7:
--- Quote from: andrew on March 02, 2023, 08:52:57 am ---I picked up an 800K drive cage but there isn't enough clearance between it and my vertically mounted X-Profile. Is there a supported way to install it horizontally like the original widget drive?
--- End quote ---
AFAIK, the X/ProFile fits above all of the various 3.5" floppy drive mounting configurations that were available for the Lisa. The top edge of the X/ProFile should be aligned with the top edge of the removable drive cage.
If the floppy won't fit under it then double check your drive mount to see if the floppy will actually align with the front panel slot.
If the problem persists, a picture may be the best way to describe the issue.
There is no problem mounting it horizontally if you prefer... perhaps someone has done that and can share a picture?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version