VT101 8085 CPU Fault
mhs.stein at gmail.com
Fri Jan 23 21:55:03 CST 2015
FYI, the 24 to 28 pin adapters I mentioned previously have selectable
polarity chip selects:
----- Original Message -----
From: "Pete Turnbull" <pete at dunnington.plus.com>
To: <General at classiccmp.org>; "Discussion at classiccmp.org:On-Topic and
Off-Topic Posts" <cctalk at classiccmp.org>
Sent: Friday, January 23, 2015 9:53 PM
Subject: Re: VT101 8085 CPU Fault
> On 24/01/2015 00:52, Johnny Billquist wrote:
>> On 2015-01-24 01:29, Robert Jarratt wrote:
>>> 1. Given the ROM is marked: CN55004N 8232, DEC TP03, 23-028E4-00, and
>>> it is 24-pin, is MCM68766 really the right choice?
> As close as you'll get in an EPROM, modulo chip select polarities. Someone
> on the list promised me a few some years ago, but I never got them :-(
>>> 3. Does anyone have a ROM image for the VT101?
> I don't, sorry, but if anyone get an image dumped, I'll host it alongside
> the others on my website.
>> Given it's "8232", I could suspect that it would be a 4K rom...
> Nope, it's 8K. A DEC 23-xxxE4 part number specifies 8K ROM. I expect
> 8232 is the date code.
> Pete Turnbull
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