18 Dec
2000
18 Dec
'00
5:38 p.m.
The RX02 has afair 77 tracks, 26 sectors at 256 bytes giving 512512 bytes.
In RSX11M sources at some places an RX03 is mentioned at double RX02
capacity. This was never sold by DEC. But an 1 Mb 8" floppy is very much
possible.
Wim
----------
From: ajp166 <ajp166(a)bellatlantic.net>
To: classiccmp(a)classiccmp.org
Subject: Re: VT180/Robin system help needed
Date: Monday, December 18, 2000 8:06 PM
From: Claude <claudew(a)sprint.ca>
The owner told me the Robin board was modified to
use 1M drives (?).
There are a couple ou wire jumpers on the Robin board. Also got some
disks, Robin schematics, a few CP/M manuals...
1m???? maybe two sided 8". the best you can do with it is 800k using
80tr/2sided DD.
2 BNC connectors on the Robin board. Whats coming
outta there? video? on
both? composite?
Those are on the VT100 board. Video in and video out, VT100 can sync to
external video. Makes a fair char gen.
What drives should I be using to boot the Robin?
The RX50-AAs or the
Shugarts 400L?
SA400s but if he modded the boot roms then anything goes.
I see 2 DB25 ports on the Robin board and a larger
(DBxx) on the VT100
board, anything special?
larger DB (37 pins) is on the VT180 card and is the FDC connector.
The VT180 is the 54-15152 board { z80, 64k dram, 4 8251s, 1793}.
DIP switches on VT100...whats the deal there?
config for AVO, serial port (DTR/DTC if memory serves).
Anything else I should look out for?
Anybody know where VT180 info is available...I would like to see the
guts of one...
the Vt180 design is near textbook z80 without zilog peripherals.
I have a fair amount but,not scanned. I've hacked the board hard. I
bought
a box of Vt180 cards (about 20 of them) and mods I've worked include:
Standalone (no VT100 required)
2 sided
Z80 @6mhz
Modded bios for 782k on 3.5" floppy
IDE interface hacks
CP/M in ROM
Extended ROMs and paged ram
I've used it as a stand alone printerbuffer.
Allison