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Type: Posts; User: Ruud

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  1. Replies
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    Having placed two RAM ICs in the same memory...

    Having placed two RAM ICs in the same memory range and one fails by not driving the bus anymore, then the other one one covers this loss and the computer won't notice this. But there two good reasons...
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    It will work, I'm sure you can boot DOS in this...

    It will work, I'm sure you can boot DOS in this way. But a lot of programs expect to find real video so they can speed up thing by handling the video memory directly. In other words: your system...
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    My first speedloader was SpeedDOS. Then I found...

    My first speedloader was SpeedDOS. Then I found EXOS V3. The advantage of EXOS V3: no extra hardware needed and you only had to change the ROM in the C64. It was slower but not much. Then I was given...
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    That should help. Thank you very much!

    That should help. Thank you very much!
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    Using a MD2202 (disk-on-chip) under DOS

    I saw a thread in "PCs and clones" about XT-IDE and DOMs. This triggered this idea: I have some MD2202s laying around and wondered if they could be used in combination with XT-IDE. But I soon found...
  6. Goh, waar heb ik dit aanbod nog meer gezien? :)

    Goh, waar heb ik dit aanbod nog meer gezien? :)
  7. This is indeed a good start. Thank you!

    This is indeed a good start. Thank you!
  8. Thank you for the link. But as said in my...

    Thank you for the link. But as said in my original post, I don't have the knowledge (yet).
  9. Hallo Doug, I simply hoped for a...

    Hallo Doug,

    I simply hoped for a "ready-of-the-bench" solution. And having several other projects on my hands, something like disassembling the BIOS is out of the scope for the moment.

    I have...
  10. Manual and software for CSS EPROG BOX 2 wanted

    A friend of mine found this nice almost 30 years old programmer. But w/o manual and software. Google wasn't helpful at all: just three advertisement for selling one.

    Anybody any pointers? Thank...
  11. Thread: VA Monitor

    by Ruud
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    116

    VA? Don't you mean VGA? If you mean VGA and as...

    VA? Don't you mean VGA?

    If you mean VGA and as this thread is for 8088..80286 machines, make sure it is a 4:3 monitor. On a 16:9 your screen will be stretched. At least, that is my experience.
  12. Looking for alternative storage for a Bondwell 14

    Hello,

    I have a fine working Bondwell 14 with two FDDs. What other storage can be had for this machine? In contrary to a Commodore or PC this machine doesn't have an expansion slot which makes it...
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    For one or another reason a vital piece of...

    For one or another reason a vital piece of information was left out. It should have been "Fifteen years later I have troubles reading one of those 4x burned CDs...". It could mean that the pattern of...
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    Another issue I had with older CD drives was the...

    Another issue I had with older CD drives was the speed with which the CD was burned. I had two drives that refused to read CDs burned with 4x or faster. Another possible side effect: I have troubles...
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    Here is a dirty hack of the previous SCH, now...

    Here is a dirty hack of the previous SCH, now having two MMUs:

    61257

    Main differences: the extra MMU of course and I had to add a 139 2-to-4 demultiplexer. The MAxx outputs are activated by the...
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    759

    Thank you for the explanation. I have no...

    Thank you for the explanation.


    I have no idea yet what the costs will be with the momentary design. So far I made everything on prototype board. But there must be a first for everything.

    ...
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    The original idea still is to mimic (more or...

    The original idea still is to mimic (more or less) the Bondwell and C128. They happen to have 4 KB of ROM and boot from an external device, floppy drives in both cases. I want to start with doing...
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    Hallo Doug, You understood the schematic all...

    Hallo Doug,

    You understood the schematic all right. The reason for choosing a 8KB bank size and not 4 KB as was possible, has to do with the number of OUT instructions that have to be performed. 8...
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    Maybe it helps if I give you the schematic of my...

    Maybe it helps if I give you the schematic of my design:

    61250

    The 174 latch serves as Memory Management Unit (MMU) selecting chunks of 32KB of RAM or ROM for the first 32 KB of the address...
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    Maybe I should ask my question in another way:...

    Maybe I should ask my question in another way: the systems I know have 4 KB of ROM and 60 KB of RAM at startup. Would it be a problem if it is 32 KB ROM and 32 KB RAM?


    The System Guide only...
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    I don't know this board but maybe I can answer...

    I don't know this board but maybe I can answer some questions:
    - If it filled the gap starting from 8000h to 0B000h, only 192 KB are needed. And that number fits inside one bank of 256 KB.
    - There...
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    Another question: is there a max limit to the ROM...

    Another question: is there a max limit to the ROM size? At this moment the design is such that at start-up there is 32 KB of ROM and 32 KB of RAM. So far I didn't see anything that forbids this...
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    To be honest, no reaction at all. But I'm not...

    To be honest, no reaction at all. But I'm not looking for any info anymore because I returned the system to its previous owner two month ago. I received some nice stuff and not having that much...
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    What cards do you use? Just curiosity.

    What cards do you use? Just curiosity.
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    Thank you!

    Thank you!
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