[sdiy] OT: COSMAC Elf 2000

[anthony]

I have the 68000 from my dead Amiga 500. I always thought making an 
Altair-style computer out of that would be kind of cool.

>I honestly don't know.  I never worked with the 80x9 uCUs.  I worked with
> the 8080 and Z80, then went to higher level languages and the 68000 
> systems
> (Atari ST).
>
> Larry T.
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of anthony
> Sent: Wednesday, January 30, 2008 4:36 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] OT: COSMAC Elf 2000
>
> Oh that's right. It was the 8080. That's almost like saying a '386 is like 
> a
>
> '286. Maybe not as bad...
>
> This made me think of something else. Can you make a preporgrammed 80X9 
> uCU
> ignore its burnt ROM and use an outboard ROM?
>
> ----- Original Message ----- 
> From: "Larry Troth" <larry at unicode.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Wednesday, January 30, 2008 5:50 PM
> Subject: RE: [sdiy] OT: COSMAC Elf 2000
>
>
>> Actually the Altair was based on the Intel 8080 8-bit cpu.  Several years
>> older then the 8088/8086 cpus.  But it could still be a worth while
>> project.
>> (The IEEE-696 {?} specification did allow for 16 bit data, but the 
>> primary
>> bus was built for 16 bit address and 8 bit data.)
>>
>> Larry T.
>>
>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl
>> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of anthony
>> Sent: Wednesday, January 30, 2008 11:45 AM
>> To: synth-diy at dropmix.xs4all.nl
>> Subject: [sdiy] OT: COSMAC Elf 2000
>>
>> A while back I saw an article in Nuts & Volts magazine about the COSMAC
>> Elf
>> 2000. At first I read the project article avidly, hoping for a cool
>> project
>> that might consume a lion's share of my vast TTL logic collection. Then I
>> get to the part where it says a lot of the logic was replaced for our
>> circuit building convenience by a PAL or two. So then I was totally 
>> soured
>> onthe Elf 2000. This was one of the things I HATED about projects in
>> Radio-Electronics: they'd hook you in with a cool sounding project and
>> then
>> you'd find it was centered around some wonderful new VLSI chip that my
>> paper-route-having teenage ass couldn't afford. It was like they couldn't
>> think up a lot of decent projects for kids like me who had scrounged a 
>> lot
>> of parts from old radios & TV's. Of course the solution was to go to the
>> local library (Logansport, Indiana at that time) and bug the basement
>> clerks
>>
>> for all of their back issues of Radio-Electronics & Popular Electronics.
>> My
>> father had several of the latter and in the late 70's, they really knew
>> how
>> to put a few cool easy to build projects in their pages. I think my
>> problem
>> was I was buying RE from the period 1985-1989 (and later for a spell in
>> the
>> 90's when I was no longer a teenager).
>>
>> So the point of this messge: I thought about it and figured I could
>> probably
>>
>> make an Altair clone for cheaper than an Elf 2000 or even the original
>> COSMAC Elf. I have all sorts of 74LS373's and 74LS374's and a few 8088's.
>> I
>> know that the original Altair was based on an 8086, but the switch
>> shouldn't
>>
>> be too hard.
>>
>> It would be cool if I had some hex display Nixies (all mine are decimal),
>> but a huge LED array and an army of 7-segment displays should work fine.
>>
>>
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