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

Posted on 2021-01-29, 12:35

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

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

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

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

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

Posted on 2019-12-19, 01:40

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

Posted on 2019-04-13, 18:51

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, 17:59

in Milliways
HanJammer wrote: JED file: https://mega.nz/#!hYEihSAY!fcyhoVGlhlSLmES_Nn … BASQydeDKQOjkh0 I will try burning GAL16V8B. The .JED file is OK. Btw, I've slightly updated the code for u5_cs and u8_cs in my first post, but that shouldn't have any effect in your case.

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

Posted on 2019-04-13, 17:26

in Milliways
try different GAL brand. Some programmers like Lattice more than NatSemi etc, some like National.. Often trying different brand helps! (sounds crazy, but its true) The ones I have are Lattice GAL16V8-15LP... Does it matter if it's -15LP or -20LNC or -25QB1 - because those are any other I can source …

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