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RE: [N8VEM-S100:566] S-100 68K CPU board status
Thanks John. Unfortunately I am a little confused where to go from there.
I think I can write code to do console I/O and talk to the dual IDE board
(with CF cards) but how do I splice this BIOS into the generic CPM68K. Where
do you have that.
BTW could I run the system using an Intel 8259A is "read status mode" from a
single interrupt. As you know the 8259A in it's native Intel mode puts the
Int vector directly on the bus only after 3 INTA signals. However if we just
trigger one the 68K Int pins we can just read the 8259A status and get
appropriate S100 Int (1-7). Slower but at least generalized.
John Monahan Ph.D
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On
Behalf Of John Coffman
Sent: Friday, December 23, 2011 4:44 PM
Subject: Re: [N8VEM-S100:566] S-100 68K CPU board status
Start at http://n8vem-sbc.pbworks.com/
Under the tab "Pages & Files", folders to traverse are:
1 Board Information
2 ECB Processor Boards
3 ECB Baby 68000
direct link board description:
4 BIOS ROM images
direct link BIOS docs:
Bios 8 is the latest posted.
On 12/23/2011 02:10 PM, John Monahan wrote:
> John could you direct me to the most relevant URL for the ECB baby
> M86K Thanks John
> John Monahan Ph.D
> -----Original Message-----
> From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com]
> On Behalf Of John Coffman
> Sent: Friday, December 23, 2011 12:04 PM
> To: n8vem...@googlegroups.com
> Subject: Re: [N8VEM-S100:564] S-100 68K CPU board status
> The ECB baby M68k approach has been to write a BIOS that can load from
> CF card. The next round of the BIOS will have Floppy support (1.2Mb,
> 720Kb, 1.44Mb).
> I haven't tackled CP/M-68 yet; but I don't see it as very difficult to
> support above the BIOS level.
> Ultimately I'd like to see real CP/M diskettes supported: 128
> bytes/sector FM mode.
> On 12/23/2011 09:38 AM, John Monahan wrote:
>> Hi Guy's, While waiting for a few components to arrive for the S-100
>> VGA prototype board (very slow here this time of the year, very
>> frustrating), I have been browsing the web looking for the easiest
>> way in software to get CPM68K running with our 68K board, ZFDC board etc.
>> Has anybody done this in the classical way, i.e. write a BIOS is
>> assembler link it in with DR's code, place it on a 8" disk and get
>> going from there. Most of what I see is in C code and/or requires a
> CPM68K OS already running to get going.
>> John Monahan Ph.D
>> -----Original Message-----
>> From: n8vem...@googlegroups.com
>> On Behalf Of Andrew Lynch
>> Sent: Friday, December 23, 2011 7:00 AM
>> To: n8vem...@googlegroups.com
>> Subject: [N8VEM-S100:562] S-100 68K CPU board status
>> Hi Mike! We made some changes to the third prototype to add the TMI
>> circuitry and remove some of the redundant debugging hardware.
>> You'll notice the board is using the DIP-64 version of the CPU so it
>> is back to closer to your MMU design.
>> The PCB is taking forever to clean up the trace routing although
>> recently it is showing signs of improvement. Slowly though...
>> Please keep up with the MMU design because there is going to be an
>> S-100 68K CPU board eventually!
>> Thanks and have a nice day!
>> Andrew Lynch
>> PS. Sorry I've been slacking on the 68K work, guys, I've been just up
>> to my neck, it's getting closer to the front burner however.
>> Mike Sharkey