Professional ROM and 4 physical disk drives on Scorpio. How?
ZXNet echo conference «hardware.zx»
Hello, All
Subject
As you know, only 2 physical disk drives can be connected to Scorpios, because...
it does not decrypt signals for sampling drives C and D. This is not difficult
can be treated by installing one ID7 and a couple of wires. In general, that’s how I feel
done.
The task arose to install a professional ROM (I hope to have SMUC in the near future :))
I came across a problem - when installing Prof ROM, my C drives are cut off
and D - writes No Disk and that’s it. I plug in a regular plug, everything is fine.
I really, really don’t want to lose two disk drives.
Where did the dog rummage?
Help me with advice on how to make friends with physical drives C, D and Prof ROM.
Thanks in advance.
Hello spensor
It’s better to collect SMUK yourself for now. Ready - it is still unknown when.
Hello, Evgeny Muchkin
Evg> Where did the dog dig?
Everything is very simple - there is a problem in ProfPZU - it sets flags (somewhere in
8-page memory) and access to these disks is blocked at the TRDOS level (the
TRDOS in ProfPZU is modified). I don’t remember exactly in the topic “SMUC on discretes” or
in PS, but we have already considered this problem. I don’t know how to treat it.
Hello, Evgeny Muchkin
Evg> Because they exist.
And because they exist, we need to pick at SMUC? I wonder what will happen if
four flops will want two screws?
Hello, Evgeny Muchkin
Evg> I just figured it out:
Evg> The person on the scorp has 4 real flops => that means he has it on board
Evg> modification done => which means most likely he did it himself => soldering iron
Evg> can hold :) => having a simple scheme for modifying SMUC, he can
Evg> add a couple of cases to it. :)
One small question - why four flops?
Hello, Evgeny Muchkin
Ah! Got it :) In SMUCse, bits 6 and 7 work as they should, but 3 and 5 are clean
stray due to the increase in SE. Apparently this is what is meant.
> But why are there 4 disk drives, this is admittedly an interesting question, there are two of them
> with 1MB of RAM it’s not really needed.
Some have 1MB, and some only 256K :)
Hello Mick
Gentlemen, iron workers, specialists.
Please tell me how many additional microcircuits will need to be mounted on
SMUC so that bits 4 and 5 of port #7FBA of the original relish work? If so
Refinement is generally possible based on the original taste, of course.
I just figured:
The person on the scorp has 4 real flops => that means he has it done on his board
modification => it means most likely he did it himself => he knows how to hold a soldering iron :)
=> having a simple modification scheme for SMUC, it will be able to add a couple of cases to it.
:)
But in this situation, reworking the ROM becomes a more realistic matter than
now.
Hello icebear
ice> One small question - why four flops?
Because they exist.
Hello icebear
That's why I'm asking. If such an iron modification is difficult to implement, then
really, nafik is needed. And if it can be done quite easily, then why?
no matter what. :)
Hello spensor
spe> PS; Small; clarification - in SMUCse, bits are used in port #7FBA
spe> D5 and D3. This problem arises due to the peculiarities (glitches) of processing
spe> versions of the SMUC board with ProfPZU firmware.
I don’t understand, but how does SMUCse work in general? And how do they work in this case?
real drives A; And; B; ?;
Hello, Evgeny Muchkin
ice> And because they exist, you need to pick SMUC? I wonder what
ice> will it happen if you want two screws for four flops?
Andreas, a regular SMUC holds 2 screws - master and slave. This is standard for
any type of IDE channels. Any device pairs are possible: HDD+HDD, HDD+CD/DVD,
HDD+CF, CF+CF, CF+CD/DVD.
But why 4 disk drives, this is admittedly an interesting question, there are two of them at 1MB
RAM is not really needed.
PS; Small; clarification - in SMUCse, port #7FBA uses bits D5 and D3.
This problem arises due to the processing features (glitches) of the SMUC version of the board
ProfPZU firmware.
Hello, Evgeny Muchkin
I was thinking... why really smoke the iron part of the relish??
Isn't it easier to just correct the RST 8 procedure; db; #81 ?
When it determines (somehow it does) that drives C and D are not
mounted, then the transition to the No Disk message should be displayed.
What if instead of this transition we make jp to LAB_1FEB, and let it be TR-DOS
understands whether there is a disk in the drive or not.
What do you think?