View Profile: tonata - Vintage Computer Forum

Yesterday, 01:24 PM

modem7 replied to a thread Action Replay PC (ISA card): manual, box, disk, PCB scans in Vintage Computer Hardware

I have hosted the files at here], in the Datel section. Within the PDF of the instruction manual, I performed OCR (which also de-skewed pages),...

4 replies | 94 view(s)

December 4th, 2019, 05:35 PM

modem7 replied to a thread ibm 5151 blinking cursor then shuts off in Vintage Computer Hardware

Regarding symptom #1. It sounds like the symptom is triggered by heat: When the symptom appears, the symptom 'cause' cools down, and everything...

3 replies | 94 view(s)

December 4th, 2019, 01:03 PM

modem7 replied to a thread ibm 5151 blinking cursor then shuts off in Vintage Computer Hardware

I see two symptoms, with different causes: #1. 5151 shutting down. #2. Unexpectedly seeing only a blinking cursor when the 5151 is moved to a...

3 replies | 94 view(s)

December 1st, 2019, 07:41 PM

gekaufman replied to a thread California Computer Systems model 2422 FDC for Exidy Sorcerer in S-100

I have an original CCS2422 that came in a system I purchased. I have never used it. U21 is not installed, I have read U22 and U23 (74S287 PROM)...

10 replies | 224 view(s)

November 30th, 2019, 10:55 PM

modem7 replied to a thread Seagate ST-4053 and IBM AT in PCs and Clones

NOTE: Below is for IBM DOS 3.3 - other makes/versions may have different behavior. 1. I brought out my IBM XT, which is fitted with a 20MB 'MFM'...

30 replies | 757 view(s)

November 30th, 2019, 09:35 PM

modem7 replied to a thread Seagate ST-4053 and IBM AT in PCs and Clones

It is MFM.

30 replies | 757 view(s)

November 30th, 2019, 07:55 PM

modem7 replied to a thread Seagate ST-4053 and IBM AT in PCs and Clones

If one starts Speed Disk, then chooses not to perform the optimise operation, then Speed Disk shows the current block map (distribution of used and...

30 replies | 757 view(s)

November 30th, 2019, 03:30 PM

modem7 replied to a thread Seagate ST-4053 and IBM AT in PCs and Clones

That is not how I am seeing IBM DOS 3.3 behaving (as observed via the 'block' map in Norton Speed Disk). I expect that over the years, Microsoft...

30 replies | 757 view(s)

November 30th, 2019, 02:31 AM

modem7 replied to a thread Seagate ST-4053 and IBM AT in PCs and Clones

But maybe the POST in that 386 does not try to read the last track. The POST authors do not need to copy IBM. And DOS is probably not going to...

30 replies | 757 view(s)

November 28th, 2019, 09:31 PM

modem7 replied to a thread Generic IBM AT Power Supply in a IBM 5150 in PCs and Clones

It does. See the 'Modern power supplies' section at here].

43 replies | 658 view(s)

November 28th, 2019, 02:11 PM

modem7 replied to a thread Plus Hardcard 20 error in Vintage Computer Hardware

Imagine that sometimes, at 5150 power on, the spindle motor in the drive is unable to overcome 'head stiction' to spin the platter. If that...

11 replies | 240 view(s)

November 28th, 2019, 12:44 AM

modem7 replied to a thread IBM EGA Card Memory Expansion Boards in PCs and Clones

The photos at here] show how close the IBM Graphics Memory Expansion Card comes to the adjacent card in an IBM 5170. Clearly, that is why the IBM...

14 replies | 327 view(s)

November 28th, 2019, 12:02 AM

modem7 replied to a thread Plus Hardcard 20 error in Vintage Computer Hardware

"1701" is generated by the BIOS expansion ROM on the Plus Hardcard (and other XT-class hard disk controllers). Part of the code in that ROM gets...

11 replies | 240 view(s)

November 27th, 2019, 10:10 PM

modem7 replied to a thread ISA Floppy/Game/Serial/Parallel Card in 5150? in PCs and Clones

There were many different models. I suggest that you should avoid any for which you cannot locate switch/jumper setting information. Manuals for two...

9 replies | 209 view(s)

November 27th, 2019, 09:53 PM

modem7 replied to a thread IBM 5150 troubleshooting in PCs and Clones

Yes, under the large and medium sized aluminium electrolytic capacitors is glue. Line suppression capacitors are supplied in various forms. In...

18 replies | 367 view(s)

November 27th, 2019, 09:38 PM

modem7 replied to a thread IBM EGA Card Memory Expansion Boards in PCs and Clones

Got it. Where in the PDF, it shows "12.70", I measure 13 mm, so close enough there. However, the two holes in the IBM EGA card are 4 mm...

14 replies | 327 view(s)

November 27th, 2019, 06:35 PM

modem7 replied to a thread IBM EGA Card Memory Expansion Boards in PCs and Clones

I receive a HTTP 404 error for that link. I will get back to you on that; I have a few things to do now.

14 replies | 327 view(s)

November 27th, 2019, 04:35 PM

modem7 replied to a thread Seagate ST-4053 and IBM AT in PCs and Clones

I have a fully functional IBM 5170, fitted with a type 2 drive, an ST-4026. If I change the hard drive type number in SETUP from 2 to 3, then restart...

30 replies | 757 view(s)

November 27th, 2019, 03:34 PM

modem7 replied to a thread Generic IBM AT Power Supply in a IBM 5150 in PCs and Clones

The thread at here] appears to show a matching motherboard connector. If it is a mtach, the thread suggests a PSU for the Compaq Presario. The label...

43 replies | 658 view(s)

November 27th, 2019, 03:19 PM

modem7 replied to a thread Generic IBM AT Power Supply in a IBM 5150 in PCs and Clones

Note that if the replacement PSU does not generate -5V, then it will be a problem for the IBM 5150. See the 'Modern power supplies' section at here].

43 replies | 658 view(s)

November 27th, 2019, 02:30 PM

modem7 replied to a thread IBM EGA Card Memory Expansion Boards in PCs and Clones

See here]. Hole diameter is 4 mm.

14 replies | 327 view(s)