Tarek
I made a post with some tips for the pidp8
https://vintagecomputer.net/browse_thread.cfm?id=663
BIll
On Sun, Apr 21, 2024 at 8:16 PM Tarek Hoteit via cctalk <
cctalk@classiccmp.org> wrote:
> Mike, any tips or guidelines for running an emulated PDP on a Raspberry Pi
> ?
>
> Regards,
> Tarek
On 4/21/24 17:44, ben via cctalk wrote:
> On 2024-04-21 5:26 p.m., Chuck Guzis via cctalk wrote:
>> On 4/21/24 12:11, ben via cctalk wrote:
>>> I keep finding I still need 74XX just for having 10 TTL loads,
>>> and 74LSXX just does not have the power.
>>
>> Ever try BiCMOS chips? IIRC, the
> On 04/21/2024 7:06 PM CDT Peter Coghlan via cctalk
> wrote:
>
>
>
> Why is that? Did the Z80 take more cycles to implement it's more complex
> instructions? Is this an early example of RISC vs CISC?
>
> Regards,
> Peter Coghlan
I'm certainly no authority, but I have programmed both
My first exposure to a computer at home was a BBC Micro with 32kB of RAM and
32kB of ROM. Included in this was a 16kB BASIC ROM which was regarded as fast
and powerful, featuring 32 bit integer variables, 40 bit floating point
variables, variable length strings, structured programming constructs
On 2024-04-21 5:26 p.m., Chuck Guzis via cctalk wrote:
On 4/21/24 12:11, ben via cctalk wrote:
I keep finding I still need 74XX just for having 10 TTL loads,
and 74LSXX just does not have the power.
Ever try BiCMOS chips? IIRC, the 74ABTxxx will drive loads of up to 60
ma, far in excess of
Mike, any tips or guidelines for running an emulated PDP on a Raspberry Pi ?
Regards,
Tarek Hoteit
> On Apr 21, 2024, at 08:08, Mike Katz via cctalk wrote:
>
> Well my PDP-8 was built in 1974 and is still running (with careful
> maintenance). My PiDP-8/I has been up and running
On 4/21/24 12:11, ben via cctalk wrote:
> I keep finding I still need 74XX just for having 10 TTL loads,
> and 74LSXX just does not have the power.
Ever try BiCMOS chips? IIRC, the 74ABTxxx will drive loads of up to 60
ma, far in excess of old 74xx parts.
--Chuck
On 2024-04-21 3:27 p.m., Jerry Weiss wrote:
While intention might have been to last XX years, I am becoming
increasingly pessimistic about longevity of most electronic devices. A
crystal radio with an open air capacitor seems like the only good bet.
Between electrolytic capacitor aging
While intention might have been to last XX years, I am becoming
increasingly pessimistic about longevity of most electronic devices. A
crystal radio with an open air capacitor seems like the only good bet.
Between electrolytic capacitor aging challenges, discrete and integrated
circuit hermetic
Here is the article I found, but I suppose others have already seen this?
The legendary Ziglog Z80 CPU is being discontinued after nearly 50 years
https://www.techspot.com/news/102684-zilog-discontinuing-z80-microprocessor-after-almost-50-years.html
Seems while the Ziglog EZ80 is compatible and
> On Apr 21, 2024, at 3:11 PM, ben via cctalk wrote:
>
> On 2024-04-21 8:45 a.m., Mike Katz wrote:
>
>> As for the RP2040 being cheap crap, I beg to differ with you. It is a solid
>> chip, produced in 10s of millions at least. And, I would bet, a better
>> quality chip than your Z-80, if
On 2024-04-21 8:45 a.m., Mike Katz wrote:
As for the RP2040 being cheap crap, I beg to differ with you. It is a
solid chip, produced in 10s of millions at least. And, I would bet, a
better quality chip than your Z-80, if due only to improved IC
manufacturing technologies.
The pi looks
On 4/21/24 09:37, Mike Katz wrote:
> Even the 6809 could push up to 8 registers (up to 10 bytes) at once on
> one of two stacks in a single two byte instruction.
The 6809 was introduced the same year as the 8086. The 80186,
introduced in 1982, did have the "PUSHA POPA" instructions and was
Even the 6809 could push up to 8 registers (up to 10 bytes) at once on
one of two stacks in a single two byte instruction.
On 4/21/2024 11:27 AM, Chuck Guzis via cctalk wrote:
On 4/21/24 07:45, Mike Katz via cctalk wrote:
One of the biggest features of the Z-80, the extra register set, was
On 4/21/24 07:45, Mike Katz via cctalk wrote:
> One of the biggest features of the Z-80, the extra register set, was
> rarely used in open source software in order to maintain compatibility
> with the 8080.
My understanding of the extra (partial) set of registers on the Z80 was
that they were
Well my PDP-8 was built in 1974 and is still running (with careful
maintenance). My PiDP-8/I has been up and running continuously with a
Raspberry PI 3B running it for about 5 years now. My PiDP-11 has been
up and running with a PI-4B for more than 4 years continuously.
Though I agree with
https://www.youtube.com/watch?v=YXTQvlkYJvI=4s
On 2024-04-20 8:33 p.m., Mike Katz via cctalk wrote:
For anything more sophisticated than your coffee pot the RP2040 from
Raspberry Pie is a fantastic little chip, dual core 133 MHz Cortex M0+
with 8 PIO engines, 264K of RAM, ADC, UART, SPI, I2C all for under a
dollar. I designed a fully
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