If not, a slomo device should be quite easy
to make - a 555 timer pulling the /wait line low
every now and then will slow the z80 down.
When pulled down a little too long the ASIC might miss a
refresh cycle causing RAM corruption.
As for 128K emulation I think software emulation or software
Andrew Gale wrote:
128 peripherals may not like working at a 6MHz clock.
That reminds me of an idea I had - quite often the sound in Speccy games
being played on the sam is horrible because of the different clock
speeds. What would be involved in making a software-controllable clock?
For
At 14:27 19/07/2000 +0100, Andrew Gallagher wrote:
That reminds me of an idea I had - quite often the sound in Speccy games
being played on the sam is horrible because of the different clock
speeds. What would be involved in making a software-controllable clock?
For example, a small piece of logic
I thought the Coupe's mode 1 was already slowed down
to speccy speeds... is this not the case (never having
been a speccy user I've never bothered trying to find
out). If not, a slomo device should be quite easy
to make - a 555 timer pulling the /wait line low
every now and then will slow the z80
A SAM Multiface is what I would like most...
If you have the time, please elaborate!
Frans
Andrew Gale wrote:
OK, since there seems to be some interest in this, I thought
I would mail my musings on the subject.
The SAM's memory map, as you know, consists of 4 16K chunks
called A (0-3FFF) B
OK, since there seems to be some interest in this, I thought
I would mail my musings on the subject.
The SAM's memory map, as you know, consists of 4 16K chunks
called A (0-3FFF) B (4000-7FFF) C (8000-BFFF) and D (C000-).
The Speccy 128 map also has 4 16K chunks, A being one of two
16K roms -
compatibility - some technical details
OK, since there seems to be some interest in this, I thought
I would mail my musings on the subject.
The SAM's memory map, as you know, consists of 4 16K chunks
called A (0-3FFF) B (4000-7FFF) C (8000-BFFF) and D (C000-).
The Speccy 128 map also has
Check out ebay for a Spectrum, 128 service manual - which may be handy!!!
http://cgi.ebay.co.uk/aw-cgi/eBayISAPI.dll?ViewItemitem=383336764
The guy who is advertising this has got some other sinclair
stuff on sale - but look at the prices! 650 quid for an MK14,
and 150 for a jupiter ace ram
