I could use a little help troubleshooting a backup Zip GSX card that I bought used installed in a ROM 3 IIgs.
The card appears to work fine with _one_ exception -- When it is installed I cannot enter the Desk Manager (Desk Accessories/CDA Menu) using the command-control-escape keyboard sequence.
As you know, when that key sequence is entered, (provided interrupts are not disabled) the ADB controller sends an interrupt that is identified and then the Desk Manager routine is initiated.
For some reason, the CPU on the Zip GSX is either not receiving the interrupt, is ignoring it, or is not able to access the Desk Manager vector.
Here's what I've tried:
1. Remove Zip GSX and re-install original 65C816 - Desk Manager IS accessible. (So, the computer and keyboard are functioning fine).
2. Re-install Zip GSX and re-seat Zip GSX cable and ensure all pins are inserted correctly - Desk Manager is NOT accessible.
3. Enter the monitor and run short program to clear the interrupt disable flag (CLI - 58) - Desk Manager is still NOT accessible.
4. Ensured that the S1 (Control Panel Disable) Jumper is not jumpered on the ROM 3 motherboard - Desk Manager is NOT accessible. <BTW, this jumper may just disable control panel access, not the CDA menu>.
So, what's left - bad CPU, bad cable, broken trace? Other than this issue, everything else seems fine with the Zip GSX. I'm stumped.
Has anybody here experienced this before or perhaps can shed some light on what is happening?
> I could use a little help troubleshooting a backup Zip GSX card that I > bought used installed in a ROM 3 IIgs.
> The card appears to work fine with _one_ exception -- When it is installed I > cannot enter the Desk Manager (Desk Accessories/CDA Menu) using the > command-control-escape keyboard sequence.
> As you know, when that key sequence is entered, (provided interrupts are not > disabled) the ADB controller sends an interrupt that is identified and then > the Desk Manager routine is initiated.
> For some reason, the CPU on the Zip GSX is either not receiving the > interrupt, is ignoring it, or is not able to access the Desk Manager vector.
> Here's what I've tried:
> 1. Remove Zip GSX and re-install original 65C816 - Desk Manager IS > accessible. (So, the computer and keyboard are functioning fine).
> 2. Re-install Zip GSX and re-seat Zip GSX cable and ensure all pins are > inserted correctly - Desk Manager is NOT accessible.
> 3. Enter the monitor and run short program to clear the interrupt disable > flag (CLI - 58) - Desk Manager is still NOT accessible.
> 4. Ensured that the S1 (Control Panel Disable) Jumper is not jumpered on the > ROM 3 motherboard - Desk Manager is NOT accessible. <BTW, this jumper may > just disable control panel access, not the CDA menu>.
> So, what's left - bad CPU, bad cable, broken trace? Other than this issue, > everything else seems fine with the Zip GSX. I'm stumped.
> Has anybody here experienced this before or perhaps can shed some light on > what is happening?
> Thanks.
> Hugh Hood
IIRC there is an alternative key sequence to enter the control panel on a ROM 03.
> I could use a little help troubleshooting a backup Zip > GSX card that I bought used installed in a ROM 3 IIgs.
> The card appears to work fine with _one_ exception -- > When it is installed I cannot enter the Desk Manager > (Desk Accessories/CDA Menu) using the command-control- > escape keyboard sequence.
> As you know, when that key sequence is entered, > (provided interrupts are not disabled) the ADB controller > sends an interrupt that is identified and then the Desk > Manager routine is initiated.
> For some reason, the CPU on the Zip GSX is either not > receiving the interrupt, is ignoring it, or is not able > to access the Desk Manager vector.
> Here's what I've tried:
> 1. Remove Zip GSX and re-install original 65C816 - Desk > Manager IS accessible. (So, the computer and keyboard are > functioning fine).
> 2. Re-install Zip GSX and re-seat Zip GSX cable and ensure > all pins are inserted correctly - Desk Manager is NOT accessible.
> 3. Enter the monitor and run short program to clear the > interrupt disable flag (CLI - 58) - Desk Manager is still > NOT accessible.
> 4. Ensured that the S1 (Control Panel Disable) Jumper is not > jumpered on the ROM 3 motherboard - Desk Manager is NOT accessible. > <BTW, this jumper may just disable control panel access, not the CDA menu>.
> So, what's left - bad CPU, bad cable, broken trace? Other than this > issue, everything else seems fine with the Zip GSX. I'm stumped.
> Has anybody here experienced this before or perhaps can shed some > light on what is happening?
> Thanks.
> Hugh Hood
Obviously, there could be a problem with the card itself, but, there is a switch that affects Interrupts, called the Appletalk, or Interrupts Delay. This switch should be set to on to avoid this delay from taking place. It is SW1, switch 3. Try setting this switch to ON, or UP, and see if it makes any difference.
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