Paul wrote:Are these CP/M versions emulating a 8080 or z80 processor?
The Z80 is code compatible with 8080 code.
CP/M itself as supplied by Digital Research should run on either a 8080, 8085 or a Z80.
However, system specific code (the low level input/output code written for a Z80 system) and some applications were written for Z80 CPU's and as such will not run on 8080 systems or 8085 systems.
I assume these QL CP/M packages supplied the correct low level system specific code.
Mark
Standby alert
“There are four lights!”
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer in Somerset later in the year
QL, Falcon, Atari 520STFM, Atari 1040STE, more PC's than I care to count and an assortment of 8 bit micros (Sinclair and Acorn)(nearly forgot the Psion's)
I have an expansion card that plugs into the QL Expansion port and some 5.25" discs, which is 68K CPM.
I never really got it working, need a 5.25" drive.
Derek - someone has recently messaged me about a Miracle 5.25" disk drive ....
I need some photos of this for the QL Wiki and details - is there a ROM which could be read for example - this will be the Quest interface (very rare indeed) !!
Otherwise Norman has read in 5.25" disks for me before!
Yes, the picture on the QL Wiki is taken from their advertising and is marked MPC Module Iss A - so not sure if this might just be an early version or something different (certainly their pull out brochure made only a reference to the OS Card)..
Other than the board being reversed there does not appear to be that much difference - but you cannot tell from such a poor image...
The large chip: Mostek MK4801, looks to be a 1K 8 Bit Static ram chip. This must store the CP/M setting.
One thought was how the OS Card connected to the QL and disk interface, as most of the Quest interfaces I have seen are not through ported. Maybe a Expansion port system was sold with the M68K CP/M system.
I will see if I can get the system up and running, with old BBC 5.25" drive, I have a Qplane and a Sandy Disk interface. Though the voltage regulator input/Outputs will have to be shorted out to get the interfaces working on the Qplane system.
The large chip: Mostek MK4801, looks to be a 1K 8 Bit Static ram chip. This must store the CP/M setting.
.
Derek,
I would actually have expected to see more RAM - CP/M 68 k requires RAM at the lower addresses by design (applications are normally loaded at $400 if they haven't messed it up completely), so I'd have expected to see at least 64k RAM there to replace the QL's ROM for the vector tables and the lower area of the TPA. Or maybe it's really something entirely different.