[Coco] OS9 Pascal

[Bob Devries]

Ah, the memories....

My first computer was a DREAM 6800. MC6800 cpu, 1K ram made of two 2114 
4-bit chips, 1K rom (2708), and a whopping 64 x 32 DOTS screen, which was 
displayed using hardware DMA. Programmed in either hand assembled 6800 
machine code, or CHIP-8 high-level (!) language.

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: <RJRTTY at aol.com>
To: <coco at maltedmedia.com>
Sent: Monday, August 13, 2007 7:13 AM
Subject: Re: [Coco] OS9 Pascal



> In a message dated 8/12/07 11:08:33 A.M. Eastern Daylight Time,

> gene.heskett at verizon.net writes:

>

>

>

>>The box?  A Quest Super Elf board, RCA

>>1802 based.   It had a whopping 256 bytes of ram, but had an S-100 buss, 

>>so

> I

>>bought  it a backplane, and 4k of 300ns static ram on a board I had to 

>>build

>

>>that cost us $300 in the late 70's.  The final code was about 1200  bytes,

> 500

>>or more of which were lookup tables for character fonts on  5x7 video

> displays

>>or timing constants.  I also built the video it  needed, a huge 120 line

>>high "8.8" display by hand.  That took 6  bytes of DMA per video frame to

>>service.

>

>

> HA!!!

>

> you think that's retro?  I am assembling a GENUINE replica of a

> MARK-8.   1 K of 1101 ram and a 8008 processor.   Ok so  maybe it

> has a little more ram BUT no S-100 bus.   Just six cards

> wired together with bare bus wire so if you make a mistake

> it will take you at least 2 hours to get to it to fix it.

>

> And the programming is done with mechanical switches and LED

> lights to indicate register content and such.   Keyboard optional  !

>

> Now you are talking 120mm Howitzer.  Making a  mistake  is not an option.

>

> Oh and to  make this more on topic later I will use an old 4k coco1 as  a

> remote terminal :)

>

> Roy

>

>

>

>

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