View Profile: 1ST1 - Vintage Computer Forum

January 22nd, 2021, 09:10 AM

1ST1 replied to a thread Dead AT&T M24/PC6300 PSUs - help! in PCs and Clones

Please don't forget, that the M24 PSU can not work without an external load. It even can get damaged from this. Can you share the circuit diagram?

3 replies | 73 view(s)

January 21st, 2021, 01:27 AM

1ST1 replied to a thread Repairing Oliveti M24 monitor in PCs and Clones

Maybe the potentiometers are not good anymore. If they are quite open to see the contact, they might be dirty, dust, oxydized, maybe you can try to...

17 replies | 602 view(s)

January 14th, 2021, 11:38 AM

1ST1 replied to a thread AT&T PC 6300 to 6300 Plus upgrade? in PCs and Clones

But qas I told, there was no 286 replacement board for M24. The Olivetti 286 machine of that time is the M28.

6 replies | 154 view(s)

January 13th, 2021, 02:21 PM

1ST1 replied to a thread AT&T PC 6300 to 6300 Plus upgrade? in PCs and Clones

One more tipp: If you want to make your 6300 / M24 a bit faster, then swap the 8086 to a NEC V30.

6 replies | 154 view(s)

January 13th, 2021, 12:59 PM

1ST1 replied to a thread AT&T PC 6300 to 6300 Plus upgrade? in PCs and Clones

There is no exact equivalement from Olivetti with a 286 CPU in the M24 chassis. So I don't think that this upgrade really existed. The 286 machine...

6 replies | 154 view(s)

January 11th, 2021, 07:32 AM

1ST1 replied to a thread 8086/NEC V30 XT class systems running faster than 8Mhz in PCs and Clones

Olivetti M24SP and M240 are running at 10 MHz. Both have 8086 CPU.

9 replies | 426 view(s)

January 6th, 2021, 08:59 AM

1ST1 replied to a thread The Compaq Deskpro 8086, finally! in PCs and Clones

Wow, nice, this is the direct competition to Olivetti M24 / AT&T 6300. Would be nice to see some benchmarks in comparison.

19 replies | 716 view(s)

January 6th, 2021, 08:53 AM

1ST1 replied to a thread Help identifying unknow 386 and 486 EISA Motherboards in Later PCs

The 386SX board was made in USA. That could be early Supermicro or Tyan. For the EISA board, I don't know. I have seen a similar EISA board from...

3 replies | 252 view(s)

January 5th, 2021, 10:27 AM

1ST1 replied to a thread Any opration system which runs on an i860 CPU in a 486 system? in Later PCs

Yes, I have a driver for the Olivetti EVC1 EISA VGA card based on an S3 chipset to do exactly this in Win 3.11. Never tryed until now, as I did not...

8 replies | 365 view(s)

January 5th, 2021, 07:19 AM

1ST1 replied to a thread Any opration system which runs on an i860 CPU in a 486 system? in Later PCs

If it is possible, that means it is useable. But that does not say anything about if it is usefull. There are explains in Internet that i860 was not...

8 replies | 365 view(s)

January 5th, 2021, 05:58 AM

1ST1 replied to a thread Any opration system which runs on an i860 CPU in a 486 system? in Later PCs

Just have a look at these scans...

8 replies | 365 view(s)

January 5th, 2021, 02:48 AM

1ST1 replied to a thread Any opration system which runs on an i860 CPU in a 486 system? in Later PCs

That mainboard is designed for the i860. It's not just a coprozessor. That mainboard has 64 Bit RAM bus for the i860, full access to this memory and...

8 replies | 365 view(s)

January 5th, 2021, 12:22 AM

1ST1 started a thread Any opration system which runs on an i860 CPU in a 486 system? in Later PCs

There were a few 486 mainboards where an i860 could be installed, Olivetti LSX 5010/5020, CP-486 and M480, Hauppage 4860 mainboard for example. Is...

8 replies | 365 view(s)

1ST1
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