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BOOTS v88 firmware

(59)
Oh sorry, you said the DF flag, not D. I'm just waking up. :) I'll go back and check my code, and certainly will try just the static NOPs at higher speed for
Mark Abene
59
posts
10:04 AM

UNBUILT Kit - COSMAC Super Elf by Quest Electronics

(10)
... Yeah, that is really nice – I’ve never seen one of those before either. Makes me want one for my Elf2K! Bob
Robert Armstrong
10
posts
9:04 AM

USB - TTL/RS-232 adapters and buffering

(12)
Hi Andrew, I didn't know you were hiding in this forum. You are now upgraded to unmoderated posts. You are right about the PC's. I recently bought a i5 2400s
joshbensadon
12
posts
8:47 PM

How many interrupts per second?

(4)
If I'm not mistaken, I believe that the 1802 also executes at least one instruction after it "Returns from Interrupt". But I could be mistaken.
whd_whd_whd
4
posts
6:04 PM

Old hardware available

(7)
I'm interested, but 'First Come, First Served' probably knocks me out. Ed MIGHT be the best to get it all working again. (not sure about the others) You could
whd_whd_whd
7
posts
Jun 19

RCA Microboard backplane available

(18)
"do you still have any Microboard backplane PCB's available?" I have more of everything: backplanes, Elf pcb's, protoboards. Scott
somaspack
18
posts
Jun 19

MCBASIC3 and MCSMP20

(9)
Hi all, Regarding accessing MPM-841, Try sending an email to askhagley@hagley.org and say you're interested in a copy of MPM-841: BASIC3 High-Level-Language
cmdrcosmac
9
posts
Jun 18

Challenge: 1802AE vs 1802 ACE - which is which?

(10)
I just got to reading, Allison's post on logic switching - what engineers would call dV/dt capacitance loading, and about operating in the linear region of
thinkpast
10
posts
Jun 8

RCFORTH question

(5)
I had also looked at the source and saw the same. But now I know I'm losing my mind, because not only does it work as defining a word as you do above, but I
Mark Abene
5
posts
Jun 4

1806 speed question

(36)
Mark wrote: Let me correct my previous statement concerning 1806 temperatures, as I should have been more attentive to what the micro was actually doing when I
fps16xn3
36
posts
May 22

Original ELF documentation package

(35)
I will ask them to do so.... From: cosmacelf@yahoogroups.com [mailto:cosmacelf@yahoogroups.com] Sent: Sunday, May 21, 2017 7:41 PM To:
Paul Schmidt
35
posts
May 21

High standby current 1802 Membership Card

(20)
As I read this i'm remembering that the original REV of the MC had a circuit that enabled the RAM as little as possible (maybe only in TPB?). Does that still
bill rowe
20
posts
May 16

IO extension using CDP1853 sub-circuit and !MRD

(25)
Mark wrote: To answer Josh, yes, memory-mapped I/O is always easier to implement. As long as you don't mind it taking up a slot in your address space. However,
thinkpast
25
posts
May 12

The Edukit

(14)
Go to the forum, look in Photos > Albums > EDUKIT, or click this link: https://groups.yahoo.com/neo/groups/cosmacelf/photos/albums/370764515
Dave Ruske
14
posts
May 11

Introducing my Cosmas Elf

(14)
What about the music program in Popular Electronics where the ELF plays "Simon and Garfunkal, Feeling Groovy".
joshbensadon
14
posts
May 5
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