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From: uhclemLOSE.sep08@nemesis.lonestar.org
Jim Leonard wrote:
: On Sep 8, 11:14?pm, Frank Durda IV
: wrote:
: > Well, Tandy created the 320x200x16 color mode that the IBM PcJr
:
: I am not normally one to correct Mr. Durda, but the PCjr most
: definitely did create 320x200x16. It is accessed on the Tandy the
: same way it is on the PCjr, except that the PCjr came out in 1983.
I meant a particular 320x200x16 mode. Others had 16 color
resolutions before the 1000, but you had to go buy a card from
someone and toss the one that came with the computer.
: Are you saying that some Tandy 1000 models did not have DMA? If so,
: that is news to me; I was under the impression all Tandy 1000s had
: DMA.
On the original 1000, the base unit did not have DMA. The DMA was on
the optional expansion memory card. The catalog copy:
"256K Memory Expansion Board. User-installable board
expands your Tandy 1000 to 256K RAM. Lets you add
additional memory with expansions below. Also includes
Direct Memory Access Controller which can speed up
computer operations. 25-1004 $299.95 (RSC-14)'
:
: > There were two thick technical reference volumes as I recall, plus a
: > service manual. ?No BIOS source, but all the datasheets for all the
: > chips (including home-grown ones) and peripherals, plus BIOS call
: > details, keyboard scan tables, etc.
:
: Any chance you could remember their names/numbers or something?
: Something I can search for on ebay?
In the 1986 (No 393) catalog these two items
are mentioned, but I don't know if they are the same
ones I remember:
Programmer's Reference 25-1503
Technical Reference Manual 25-1504
I have the ones I remember, but they are in storage so I can't
look up their numbers just now.
For those doing archaeological digs into the 1000 history, a thing
to remember was that the 250-xxxx* (aka 25-xxxx) series was opened
at the same time as the 1000, so all the low 25-1xxx numbers are
usually first-year 1000-related items. Frager assigned most of
those original 1000 products' catalog numbers in sequence.
So, you might search Z-bay or whomever for 25-1000, 25-1001, 25-1002,
25-1003, etc, and perhaps the first 30-50 numbers will all be first-year
Tandy 1000 stuff. There are a few minor exceptions, usually
things already in the catalog for the 2000 or the stop-gap 1200 system,
that were then re-packaged for the 1000 but still had the old 26-xxxx
number.
* Tandy used trailing zero suppression in the left-hand part of the
catalog number, so 26 was really 260, 25 was really 250, etc.
In some documents you may see items references with the zero
visible, but 250==25 and 260==26.
: > Still, there were hardware incompatibilities that didn't get resolved
: > for quite a while, like no -5V power on the ISA slots in the
: > original models, only discovered after someone bought a network card
: > from Tandy that needed -5V power to function and stuck the card
: > in one of those "compatible" slots. That's why later 1000 models
: > have a -5V regulator taped to the motherboard. We also had to
: > have custom hard-drive-cards built that used a different interrupt
: > because of IRQ conflicts on the early 1000 models.
:
: Do you happen to remember what IRQ those boards used?
"Those boards", you mean the network card that pointed-out the
problem? As I recall it was a non-ethernet card, and probably was an
IBM SNA or an Arcnet card. The early hard drive cards came
from a couple of different vendors including Tandon and Western
Digital.
Frank Durda IV - send mail to this address and remove the "LOSE":
http://nemesis.lonestar.org
"The Knights who say "LETNi" demand... A SEGMENT REGISTER!!!"
"A what?" "LETNi! LETNi! LETNi!" - 1983
Copyright 2008, ask before reprinting.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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