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Re: Can a faster ISA Graphics card be built?

Posted on 2024-04-09, 07:27

While you had one wait state on expansion cards for 16-bit cycles on the AT (just as the AT also used for RAM), RAM cards (and other cards that claim areas of 128KB contigous memory address space) can remove that wait state for memory cycles by activating the /0WS signal, and thus operate at …

Re: Can a faster ISA Graphics card be built?

Posted on 2024-04-07, 23:27

However, backwards compatibility with the older architecture (IRQ, DMA, 8-Bit i/o, ~14 MHz clock pin) and existing PC cards caused performance penalties. The 14MHz clock pin is not related to bus performance at all. No bus cycles are synchronized to that pin (except, of course, if the system clock …

Re: Can a faster ISA Graphics card be built?

Posted on 2024-04-07, 21:24

However, backwards compatibility with the older architecture (IRQ, DMA, 8-Bit i/o, ~14 MHz clock pin) and existing PC cards caused performance penalties. The 14MHz clock pin is not related to bus performance at all. No bus cycles are synchronized to that pin (except, of course, if the system clock …

Re: Can 32-bit x86 programs explicitly use IP?

Posted on 2024-04-07, 21:15

Can 32-bit x86 programs even explicitly use IP instead of EIP(which uses masking on the high 16-bits when loaded this way) during fetching (like SP vs ESP)? The decision whether IP or EIP is used as offset to CS when fetching instructions is the "D/B" bit of the code segment descriptor. If you call …

Re: Can a faster ISA Graphics card be built?

Posted on 2024-04-07, 20:30

By the time you add graphics to the board, then extra RAM to the board because the ISA is too slow, then maybe another x86 CPU to the board because the ISA is too slow, and move another couple of things to the board because ISA is too slow... you may as well be using a Powerleap Renaissance …

Re: Rare card or just forgotten?

Posted on 2024-04-06, 20:12

Will I need to use the 9-pin for a colour image? Or is it just my monitors that won’t lock on to the signal correctly? In CGA mode (your card obviously is in CGA mode now, if you get an image on your TV), I expect that at least some DIP switch combination will output something that resembles a …

Re: [SOLVED] First attempt at "let's make some 30-pin FP memories"... turned out to "let's not make stupid things again"

Posted on 2024-04-06, 16:14

Some parts of the chip number "A413256J06" have a meaning obvious to experienced electronics engineers: "256" is either the amount of kilobits or the depth (i.e. the number of addresses). On a 512KB card, I expect 4 chips of 256K x 4. "J" is the package type SOJ. "06" is the access time: "60ns". …

Re: [SOLVED] First attempt at "let's make some 30-pin FP memories"... turned out to "let's not make stupid things again"

Posted on 2024-04-06, 11:53

Thank you for all the information, rasz_pl ! I'll order ten 4M x 1 FP-RAM chips from shop.tvsat.com.pl, but now I'm in search for datasheets for unknown to me "A413256J06" chips used for VRAM on one old ISA UMC videocard (I want to double the size of its VRAM from 512 kB to maximum supported 1 MB). …

Re: Smoke coming from PAS16

Posted on 2024-04-06, 11:44

The Crystal chip has been ordered. Should I be replacing all the 10uF 16V Tantalum Capacitors on the board? There are 16 of them. Only 1 has a short. If they check out ok and didn't pop the first time it powered up I wouldn't change them, but others here may have more experience with tantrum caps. …

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