What does the memory map look like? Is there room to just stick a 27128 in to replace the 2764? You'd likely need to do something clever with the address decoding but that's no biggie.
That is what the HAWK does, except that if you're going to add a 27128 then you might as well as the HAWK which adds tons of additional space. So that is what I did. Did you ever buy the HAWK? I forget if you did.
The MDK kit from Korg was about the worst thing I've ever seen in a retrofit kit. It added only some of an additional 8K ROM and the work required to do the install was awful. And only just to add sysex. Wow, that was a bad retrofit kit.
/Mike
From: "Gordonjcp gordon@... [korgpolyex]" <korgpolyex@yahoogroups.com>
To: "Michael Hawkins korgpolyex800@... [korgpolyex]" <korgpolyex@yahoogroups.com>
Sent: Friday, May 29, 2015 1:11 PM
Subject: Re: [korgpolyex] Demodulating and Encoding the Audio/Tape Data
On Fri, May 29, 2015 at 04:18:50PM +0000, Michael Hawkins korgpolyex800@... [korgpolyex] wrote:
> If I remember correctly, the patch corruption is caused by a stack overflow that pushes the stack up into the patch memory when MIDI comes into fast for Poly to process.
> And sysex was left out of the Poly code because it can't fit with the keyboard and joystick code. So the EX-800 had sysex because it had no keyboard or joystick. I calculated fitting some sysex functions in to where the tape code was. But the tape code is actually quite small. So no luck there either. Bottom line is, there is no room.
> And as you all know, I myself poured over the assembler years ago contemplating these problems. There is literally only 6 bytes unused out 8,192. It's a real shame that Korg chose to design the Poly with only an 8K ROM. Had they added just one socket for another 8K ROM, they could have dramatically improved the Poly and charged say $100 bucks for the upgrade.
>
What does the memory map look like? Is there room to just stick a 27128 in to replace the 2764? You'd likely need to do something clever with the address decoding but that's no biggie.
The Ensoniq Mirage has 16KB of OS RAM and 4KB of boot ROM - but there's a whopping 825 bytes unused in there! You could have all sorts of boot loader-y fun.
--
Gordonjcp MM0YEQ