If one were going to put an FDC in place, the easiest probably would be the
WD3765, since it has built in cable-drivers and receivers as well as
clock/data processing hardware. You connect it directly to the cable, as I
recall. It otherwise behaves as a uPD765 (i8272).
Dick
-----Original Message-----
From: Allison J Parent <allisonp_at_world.std.com>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Saturday, April 17, 1999 10:06 PM
Subject: Re: z80 timing... 6502 timing
><Western Digital disk controllers are a little harder to get, so I'd
><change it to 'a disk controller of your choice' which means you can use
><an 8272 or whatever (trivial to get off an old PC card).
>
>1793s are common enough and cheap too. If I went with the 765 (8272)
>I have to claim unfair advantage!
>
><Considering you can make a serial port in a couple of chips, this is not
><a major design task....
>
>But it's overhead is trivial and well enough understood as to mean little.
>
>IT would be more of a challenge if each person supporting a processor had
>to use a different one. That would be a true learning experience.
>
>As to hardware... I cheat. I have SBCs for most common cpus.
>
>1976 imp48 8048 (cute little sbc with tape IO, TTY, relays)
>1977 8048 from byte 8048 (this was an 8035 with a mini front pannel)
>1980 8051 8751 (basically a 8051 SBC with monitor)
>1978 SC/mp ISP8A500 (sc/mp I)
>1979 National TBX 8073 (SC/MP II with tiny basic)
>1977 COSMAC ELF base 1802 (quest board)
>1976 6800d1 6800
>1977 kim1 6502
>1983 Telvideo 905 R65c02 (card from terminal, good as SBC!)
>1978 8x300 proto 8x300 (signetics)
>1981 SDK78 7800 (nec propritary)
>1981 78pg11 Protoboard 78pg11 (NEC propritary)
>1979 Tk80 8080
>1980 explorer8085 8085 (base card has 8085, ram and rom)
>1980 Computime CPUZ z80 (s100 card with 1k ram, serial, eprom z80)
>1981 Vt180 Z80 (z80, 64k, 4 serial, FDC, Eprom, RTC)
>1981 Hurikon MLZ92 Z80 (Z80, mmu, 64k ram, eprom, serial,FDC)
>1978 INtersil sampler (6100, 256w ram, rom, serial)
>1982 29116 proto 29116/2911 proto for bitblitter
>1982 Z8001 proto z8001 (z8001, 16k ram, 16k eprom, serial)
>1982 Falcon T-11 (pdp11 chip, ram, parallel, serial, rom)
>1979 SSS technico TI9900 (9900, ram, rom, serial)
>1986 Advice 78032 (uVAXII, serial, 96k ram, 512k rom)
> The advice was used in 87 to assist the MV2000 design!
>
> All are classics, only the Advice wasn't available in '83.
>
> Now if I wanted to get exotic, I have a load of 2901/2911s with date
> codes pre 1980. Also 29116s (pre 83). Also enough raw 8748/9 and 8751
> parts to do a major hack (maybe 50 or 60 of each). the 8749s are the
> slower 1982 parts that only run at 11mhz (instruction cycle time of
> 1.36uS) However with the prior to 1982 limit sthere are no sortage of
> choices.
>
> I'm not above using multiple cpus to do the task or mixing several
> different ones.
>
>Allison
>
Received on Sun Apr 18 1999 - 00:05:54 BST