T-11 (was Re: PDP-11/70 cache memory)
locutus at puscii.nl
locutus at puscii.nl
Tue Dec 30 22:47:07 CST 2008
> On the other hand, the Russians used their clone of a PDP-11
> microprocessor in a bunch of products--even a pocket calculator.
You are refering to the bk1011 series of machines if i recall
correctly, which are instructionset wise equivelant to a baseline
pdp11/23+ without CIS or float, but with a 22bit adress bus, there are
essentially 2 variants of this machine (with some subvariations in
amount of memory), the first is a wedgestyle (think C64 etc.)
homecomputer, which has their implementation of the 11/23 chipset,
with very very slow DRAM, running at 3.58MHz. and memory mapped bitmap
graphics, which also has a inrom emulation of a console device for the
RT-11 derived (presumedly from stolen or reverse
engineered/disassembled code), the interesting part of this machine is
though, is that it has a QBUS connector on the back of the machine,
which allows for a wide variation of (homebrewn!) addons for the
machine, i think it also has a custom local network protocol (non
rs4xx) for connecting several together to a larger soviet produced
minicomputer (i do not know what one would be used for that).
The second variant is architecturally the same, and used the same
microprocessor implementation of the -11, but is in the format of a
large graphing calculator, and is functionally equivelant to say, a
Ti81, but with very slow graphics plot from what i recall from a
ukrainian telling me about it :-), it is not freely programmable
though, and you can only run some simple BASIC-esque interpreter on
it, together with the calculator software in ROM.
the Homecomputer versions are actually not that hard to get, and go
for fairly reasonable prices on ebay (i paid 80 euros for mine
including shipping from ukraine), but the graphing calculator version
of the machine will sell for up to 500 euros, of special interest is,
that the graphing calculator was possibly the last produced consumer
computer from soviet design (it was released in 1991 from what i
recall), altough its not completely soviet from what i read, the LCD
screen was actually a western imported part.
All the best, a very very sleepy Locutus.
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