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From: Thieret.WBST@PARC-MAXC.ARPA@sri-unix.UUCP
Newsgroups: net.micro.cpm
Subject: Re: S100 vidio board info wanted
Message-ID: <4799@sri-arpa.UUCP>
Date: Thu, 1-Sep-83 12:24:00 EDT
Article-I.D.: sri-arpa.4799
Posted: Thu Sep  1 12:24:00 1983
Date-Received: Sun, 4-Sep-83 23:41:01 EDT
Lines: 53

Simpliway Products (the name is their choice...) has an excellant board
(either bare ... $50 or populated  $300) which satisfies your criteria
#1,2,4,5,6,7?,8,9,10,11,13, & 14.  Let me elaborate.

1: 80x24 is the standard package (option 1) but requires the monitor to
run at 19.25 kHz hor. sync rate.  25 lines are availible (as a different
EPROM) for the standard 15.75kHz but you lose the underline.

2: I'm not sure of the character matrix size. The font they provide I
really like and is very readible and comfortable.

3: The software listings for the program PROM are provided in source
code on a 8" CP/M floppy and you can alter them if you know Zilog
Asembler codes.  The source has lots of comments so there is no real
problem.

4: Composite video or separate sync are provided.

5: The board has 3k of 2114s on board for the local Z80 and character
memory & type ahead buffer.

6: +5 & -12 are available on the keyboard connector.

7: I don't know about this one. My system is only 6Mhz.

8: User programmable characters you can write to PROM.  They gove you a
HEX file on the disk along with a listing in the docs.

9: The video controller is the Intel 8275.  All the modes dim, reverse,
underline, & blinking are supported except as noted above for 25 lines
(but you can probably overcome that too in the software.).

10:  Z80, 3K 2114s, 8275

11:  Jumper optional on the board (interrupts).

12:  No tin the std software.  Maybe in the PROM since there's lots of
room there for custom stuff.  PROM is 2kx8bits 2714.

13:  I haven't clocked this board for speed but it's well above 9600
baud.  Usually the board is waiting for the software in my modes of
operation.

14:  There is an alternate PROM available for graphics characters which
is supported by the 8275.  You can put anything there that you want.


This should help.  I put this board together and it's no big deal if
you've done board construction before.  It's really easy to customize
the software if you've got an EPROM programmer and a system already up
and running in order to test the board.

Tracy.    (Thieret.WBST @ PARC-MAXC.ARPA)