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    Yesterday, 01:59 AM
    Dennistum replied to a thread Spirit Messages in Vintage Computer Forum Support
    Make sure you figure out if your state is in this category, most other states only allow the client to change their minds if the contractor hasn’t...
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    please reply to 8085 thread.
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    Hi Chuck - Sorry to bother you with a trivial question but I'm sure you can give me an authoritative answer - I've got a pair of Mitsubishi M4853 1/2 height 5.25" drives. I _think_ they are 1.2m drives but I see numerous references to them as 360k drives on the internet. What are they REALLY?

    Thanks,
    Jack
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    chuck smart. chuck lern me gud. thanks for all the C help.
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    Thank you Chuck for all the great explanations!
    One or two sentence of verbal info is a tremendous
    boost for learning a lot of stuff on my own....ziloo
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About Chuck(G)

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Recent Entries

PC-6300 and a Future Domain TMC-850M SCSI Controller, locking up the system

by Chuck(G) on September 9th, 2012 at 10:22 AM
There's probably a better place to put this post, but since it came up...

I've located the booklet--actually about 20 pages (AT&T pub 999-300-3091S) that gives instructions for upgrading to the 1.43 BIOS. It came with 2 EPROMs and 1 PAL, identified as "PAL 90" and as a "memory decoder PAL". It replaces PAL49 at position 2P on the motherboard.

There's some additional information regarding switches and disks in the booklet as well. In particular,

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Cloning a PAL/HAL, Part 13

by Chuck(G) on October 27th, 2011 at 06:32 PM
Part 12 of this series is here. The beginning of this series is here.

Cloning the Trantor T130B ROM PAL, continued.

In the preceding entry, we've discovered that simply reading and crunching the original PAL results in impossible garbage. In particular, nothing appears to be happening with the output on pin 13. So, let's pull out the datasheets and continuity tracer and see what gives.

The controller chip on this board is an NCR 53C400. The datasheet

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Updated October 29th, 2011 at 10:05 PM by Chuck(G)

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Cloning a HAL/PAL, Part 12 - The Trantor T130B memory PAL

by Chuck(G) on October 27th, 2011 at 05:48 PM
Part 11 is here. The beginning of this series is here.

This part of this thread is dedicated to the memory of the late Don Maslin, who never did figure out how to get his T130B to boot. We've solved it, Don!

There are probably more Trantor T130B SCSI adapters floating around than any other 8-bit ISA card, save perhaps, for the Seagate ST-01. Most of them were sold with SCSI CD-ROM drives or SCSI tape drives and lack not only the boot ROM, but also U6, a PAL that

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Updated October 27th, 2011 at 08:36 PM by Chuck(G)

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Cloning a HAL/PAL, Part 11

by Chuck(G) on October 25th, 2011 at 04:07 PM
This example details cloning the Creative Sound Blaster CT1350B U12 PAL. If you're just starting out on this thread, go to the start at Part 1.

Okay, so we've got a weird looking PAL "brute force" dump, that has 10 inputs and 8 outputs, but it doesn't work. In particular, we've noticed that the data from dumping the dupe doesn't match the original:

Code:
000000  A1 A9 B1 BB BB BB BB BB-A1 A9 B1 BB BB BB BB BB
...
008000  A1 A9 B1 BB BB BB BB BB-E1

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Updated October 27th, 2011 at 08:44 PM by Chuck(G)

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Cloning a HAL/PAL, Part 10

by Chuck(G) on October 25th, 2011 at 11:18 AM
Part 1 of this series starts here.

A real-world example--the Sound Blaster CT1350B upgrade PAL (U12 on the board with a label that says 0048013500).

This is a PAL16L8, with the security fuse blown, so it's a perfect test case. The sample file from the little "brute force" board is SB20.BIN (attached below). Running this through tt16l8, we find that there are 10 inputs and 8 outputs--no big surprise. Taking this output and running it through Minilog, we

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Updated October 25th, 2011 at 04:17 PM by Chuck(G)

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