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2022.06.03 added links to LisaList1 and LisaFAQ to the General Category

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 91 
 on: January 19, 2024, 02:57:49 am 
Started by blusnowkitty - Last post by compu_85
Here's something a bit interesting: A graph of the Lisas we've observed and their build date.

The green circle is the start of normal production. Yellow is the first observed 2/10, and red is the first observed 2/5 model A6S0300.


 92 
 on: January 18, 2024, 04:47:22 pm 
Started by Exteban - Last post by sigma7
I suppose the display will not turn on because the video card has some fault...

Do you know any procedure to repair it, or do I directly change the capacitors?

Generally, Lisa board problems can be diagnosed to individual components, but it depends on the equipment and time you have available.

I recommend you make a separate thread/topic regarding the display problem; let us know if the filament glows in the tube and examine the video board for obvious problems such as scorched areas or burned parts. Before removing the top cover, you make sure you are aware of the potentially fatal hazards of imploding vacuum tubes and high voltages and take suitable care.

Since there is some confusion about the combination of parts in your Lisa, you may find connectors unplugged etc. from whomever was working on it. What kind of hard drive is in the drive cage?

 93 
 on: January 18, 2024, 04:03:19 pm 
Started by Exteban - Last post by Exteban
Oooh, thank you very much.  It is very useful information.  According to what you have told me, the motherboard is 2/5.  I have to disconnect the hard drive.  If I leave it connected, it doesn't even turn on.  I suppose the display will not turn on because the video card has some fault...

Do you know any procedure to repair it, or do I directly change the capacitors?

 94 
 on: January 18, 2024, 02:27:02 pm 
Started by Exteban - Last post by sigma7
On the I/O board I have seen that it has two tracks deliberately cut.  It is normal?  Should I fix them?

1) The board shown is a Lisa 2/5 I/O Board, not a 2/10 I/O Board.

It will work in a 2/10 regardless, but you should check that your motherboard matches the chassis harness as these are not interchangeable between the 2/5 and 2/10.

A 2/10 Motherboard does not have a back panel parallel port (it has only two DB-25s for serial ports). A 2/10 chassis harness has one 26 pin and one 20 pin ribbon cable in the drive cage.

A 2/5 Motherboard has a back panel parallel port (making three DB-25s, including the two for serial ports). A 2/5 chassis harness has two 26 pin ribbon cables in the drive cage, and if it has a 3.5" floppy drive, a "Lite Adapter" board connecting the drive to one of the cables.

2) The cut under C34 was done at the factory by Apple; it is normal, so you should not bridge the cut.

3) The cut under C33 is the style of an Apple modification, but Apple did not add large capacitors to the rear of any boards AFAIK, so there is something odd about that, can you provide a picture of the entire topside of the board?

4) There are likely to be wires 'tacked' on the component side; Apple made some modifications in that manner too.

5) Aside from repairs, some boards may exist that have non-Apple modifications -- if there are any, they are rare. An exception is that there are numerous 512K memory boards that have been user upgraded to be 2MB boards.

edit - added memory board exception

 95 
 on: January 18, 2024, 01:49:46 pm 
Started by Exteban - Last post by Exteban

Hello.  I have bought an Apple Lisa 2/10, which does not turn on the CRT, and with an external display it indicates error 57 (disk Drive).  On the I/O board I have seen that it has two tracks deliberately cut.  It is normal?  Should I fix them?

 96 
 on: January 16, 2024, 07:59:30 pm 
Started by blusnowkitty - Last post by compu_85
BTW, I added columns for the Model No and Memory Option. Here's what I've noticed:

Model A6SB100 - Lisa 1. Memory A6SB104 must've been 1/2mb? A6SB108 is on a red sticker.
Model A6SB100P - Euro Lisa 1? Memory A6SB108.
Model A6S0200 - Lisa 2/10. Memory A6S0204.
Model A6S0200P - Euro 2/10?
Model A6S0300 - Lisa 2/5. Memory A6S0304.

If our non-US members could chime in and let us know if their Model Numbers end in P I'd appreciate it!

Thanks,

-J

 97 
 on: January 16, 2024, 02:36:37 pm 
Started by andrew_w - Last post by compu_85
Sweet! I added these to my software archive...

-J

 98 
 on: January 15, 2024, 07:34:13 am 
Started by andrew_w - Last post by andrew_w
I'm trying to get IDLE's Lisa 1 emulation working, but it just hangs at a white screen rather than showing the ROM initialization screen. I'm using the boot ROMs 341-0175-C.bin (MD5 96ada37d74640deeb113132a45292192) and 341-0176-C.bin (MD5 78d11098a4800858945e852ff65c30e3) with video state machine ROM 4334_REVC.BIN (MD5 b4a06d155ff6365e842bbc3b60626d62). Are these the correct ROMs, or should I be using different ones?

 99 
 on: January 15, 2024, 07:00:13 am 
Started by andrew_w - Last post by andrew_w
Those installed fine for me. Thanks

 100 
 on: January 15, 2024, 01:19:31 am 
Started by andrew_w - Last post by fri0701
Here's the complete 2.0 disk image set in DC42 format. All disks should be deserialized and de-bozoed.
https://www.dropbox.com/scl/fo/667vdzvefcri4rdzd1tig/h?rlkey=r2id9ljds3yzq02x9ffgi36f8&dl=0

Let me know if you have any issues with installing them.

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