Re: Fastest graphics card for Harris CS80C286-25?

Posted on 2023-09-17, 14:24

by

by suntac

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The most important thing is to use a motherboard supporting higher ISA clock speeds. If your motherboard can only operate at 7.16 MHz or 8 MHz, the graphics card will not be fully utilized.

---

Re: An AdLib-Compatible Card (1986) Older than AdLib (1987)

Posted on 2023-06-26, 21:50

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

Sergey Kiselev dug a bit more information: This card appears to have been designed specifically for the University of Delaware's GUIDO (Graded Units for Interactive Dictation Operations) software: https://winworldpc.com/product/guido-music-learning-system/21 The GUIDO software release notes …

---

Re: Finally! CMS Upgrade Equations for All SB2.0s

Posted on 2021-01-29, 12:35

by

by suntac

in Milliways

in Milliways

Yes, I know exactly how it works. The autodetection circuit is a simple 8-bit R/W register, nothing special. Unfortunately, it's completely impossible to design a full CMS-upgrade daughterboard that would plug into the 3 sockets, because there is no chip-select signal for that register available, …

---

Re: Finally! CMS Upgrade Equations for All SB2.0s

Posted on 2021-01-29, 10:41

by

by suntac

in Milliways

in Milliways

The ISA bus locks up because the IOCHRDY line doesn't return to a high level after writing to the second SAA. Try swapping the SAA chips. Then, if the 2X0 or 2x1 would lock the system, the fault would be obvious. Later you may also try disconnecting the /ENA_IOCHRDY (pin 9) from the socket and …

---

Re: Finally! CMS Upgrade Equations for All SB2.0s

Posted on 2021-01-29, 09:20

by

by suntac

in Milliways

in Milliways

An upgraded SB2.0 is not fully compatible with GameBlaster. The CMS autodetection feature is not implemented in SB2.0, so the original GameBlaster's testcard utility will never detect an upgraded SB2.0. The first SAA1099 occupies the I/O ports 2X0h and 2X1h and the second one occupies the ports 2X2h …

---

Re: Finally! CMS Upgrade Equations for All SB2.0s

Posted on 2021-01-29, 08:53

by

by suntac

in Milliways

in Milliways

Ok. Anyway, I don't believe there is any problem with the equations as I've already successfully upgraded hundreds of SB2.0s. Maybe you should use a logic analyzer to find out the real cause of the problem. Btw, did you disconnect the CMSOFF jumper? Hi, I am very experienced with these PLDs since I …

---

Re: Finally! CMS Upgrade Equations for All SB2.0s

Posted on 2021-01-29, 08:23

by

by suntac

in Milliways

in Milliways

Hi, I upgraded lots of 06xxxs and there was never a problem. The issue you describe is usually caused by choosing an incorrect GAL type when programming the GAL chip. From my experience - I bought many GAL16V8B chips remarked as GAL16V8D from China and when I tried to program them as GAL16V8 ( …

---

Re: An AdLib-Compatible Card (1986) Older than AdLib (1987)

Posted on 2020-10-22, 17:44

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

NewRisingSun wrote on 2020-10-22, 17:20: suntac wrote: Although the card's OPL2 chip was originally mapped to a different I/O port range Which one? 11 1001 11xx 😀

---

Re: An AdLib-Compatible Card (1986) Older than AdLib (1987)

Posted on 2020-10-22, 10:05

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

I always "like" the cynisysm of early hardware and software manufacturers, everybody stole from everybody and everybody went to court. Rubbing letters off the chips is one thing. But going to court all the time.... i am looking at you apple. So Even Adlib was stolen from someone else :D I don't …

---

Re: An AdLib-Compatible Card (1986) Older than AdLib (1987)

Posted on 2020-10-22, 10:00

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

VileR wrote on 2020-10-22, 09:51: So where did you find your information? And could "JBI" on the back be the initials of the designer? 😁 It's just a qualified guess. JBI was the name of the PCB manufacturer, or its acronym. The 94V0 supports that.

---

Re: An AdLib-Compatible Card (1986) Older than AdLib (1987)

Posted on 2020-10-22, 09:42

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

So it was sold comercially? It's hard to believe - if there were hundreds of them in use, why it got so forgotten? I was thinking maybe it was part of a course (like electrical engineering or such) and each student assembled their own and was assessed on the final product... but that would probably …

---

An AdLib-Compatible Card (1986) Older than AdLib (1987)

Posted on 2020-10-21, 18:37

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

Did you know there was a predecessor to the AdLib Music Synthesizer Card (1987)? Designed in 1986 or earlier as a school project at University of Delaware, it seems hundreds of them may have been produced. According to the numbers stamped under the solder mask (8640) on the card's bottom side, the …

---

Re: SB2 clone (CT 1350) Sound Machine (project)

Posted on 2019-12-27, 13:50

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

Filename _ND30342x.jpg File size 216.99 KiB Views 914 views

---

Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Posted on 2019-12-22, 12:58

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

matze79, what was primary cause of the problem with ET4000 and how did you fix it?

---

Re: SB2 clone (CT 1350) Sound Machine (project)

Posted on 2019-12-19, 01:40

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

Hi, I got the PCB from you, populated it with components, but the card was dead as a doornail. The SB DSP autodetection wasn't working at all, the OPL2 couldn't be written to, and the analog audio path was broken. After a few hours (well?) spent, here are the much needed fixes. The first two missing …

---

Re: Suntac 80286 Mainboards

Posted on 2019-11-19, 02:26

by

by suntac

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This looks like it is also laid out for 386sx. Stason indicates this is an Easy Data board. Same board layout appeared under both 286 and 386 listing, with different "factory jumpers". (I wonder if I can solder 386sx onto it and switch between 286 and 386sx) s-l1600.jpg No, you can't. It's designed …

---

Re: SB2 clone (CT 1350) Sound Machine (project)

Posted on 2019-11-10, 18:35

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

Nice work! What about the CT1336(A) IC?

---

Re: STB Ultrasound 32 Pro (Compaq Interwave sound card) - The comprehensive guide

Posted on 2019-05-31, 22:10

by

by suntac

in Marvin \ Sound

in Marvin \ Sound

Try cleaning the edge connector's gold fingers. If the card is not dirty, it might have been damaged by ESD, though.

---

Re: Finally! CMS Upgrade Equations for All SB2.0s

Posted on 2019-04-13, 18:51

by

by suntac

in Milliways

in Milliways

There must be some issue with your programmer, its settings or the chip type used. Programmer settings are OK (all other chips I program - like EPROMS - work fine). Only settings I can change for GAL are Programming voltage (set to 16V) and Encryption (I don't know if I should leave it enabled or …

---

Re: Finally! CMS Upgrade Equations for All SB2.0s

Posted on 2019-04-13, 18:04

by

by suntac

in Milliways

in Milliways

There must be some issue with your programmer, its settings or the chip type used.

---