This card based on a 8255 seem to be a good choice.
viewtopic.php?f=8&t=3837
8 io on the Centronics DB25 socket.
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- Wed Sep 23, 2020 6:13 pm
- Forum: WANTED
- Topic: Wanted : a ZX81 I/O board extension
- Replies: 6
- Views: 8667
- Wed Sep 23, 2020 6:00 pm
- Forum: SALES
- Topic: RS232 Interface (8255 Chip) £30
- Replies: 7
- Views: 9602
Re: RS232 Interface (8255 Chip) £30
Hi,
Yes, it's an (another!) Centronics card… too many datas on the socket, it's a female subd25 and there's no cristal/max232 components.
But, with a 8255, you can send a serial data on the socket… with a good zx81 program.
Yes, it's an (another!) Centronics card… too many datas on the socket, it's a female subd25 and there's no cristal/max232 components.
But, with a 8255, you can send a serial data on the socket… with a good zx81 program.
- Wed Sep 23, 2020 3:42 am
- Forum: Emulators
- Topic: [Vb81] Test release.
- Replies: 72
- Views: 67927
Re: [Vb81] Test release.
New release 23/09/2020.
* Memotech IF Centronics fixed (New ROM dumped by Erm/Bios patch)
* Memotech IF Centronics fixed (New ROM dumped by Erm/Bios patch)
- Wed Sep 23, 2020 3:38 am
- Forum: ZX BASIC
- Topic: SCROLL and MCODER II
- Replies: 5
- Views: 7164
Re: SCROLL and MCODER II
Hi, Try to type this Basic code to load the ASM program: ADD= ASM Scroll start code. (memory offset 32300, but you can store it in the PRbuff @ 16445 if the printer is not use!...only 29bytes) But, i don't know if the MCoder2 use this memory segment. 10 LET ADD=32300 20 LET C$="2A0C40EB2A0C400121000...
- Tue Sep 22, 2020 9:19 pm
- Forum: SALES
- Topic: Memopak Centronics Interface, plus another.
- Replies: 15
- Views: 12207
Re: Memopak Centronics Interface, plus another.
"Real" size pictures: http://zx81.ordi5.free.fr/memotech/MT07_IF/Memotech_If_1.jpg http://zx81.ordi5.free.fr/memotech/MT07_IF/Memotech_If_2.jpg http://zx81.ordi5.free.fr/memotech/MT07_IF/Memotech_If_3.jpg http://zx81.ordi5.free.fr/memotech/MT07_IF/Memotech_If_4.jpg http://zx81.ordi5.free.fr/memotech...
- Tue Sep 22, 2020 7:06 pm
- Forum: SALES
- Topic: Memopak Centronics Interface, plus another.
- Replies: 15
- Views: 12207
Re: Memopak Centronics Interface, plus another.
Thanks to all contributors.
- Tue Sep 22, 2020 7:03 pm
- Forum: SALES
- Topic: Memopak Centronics Interface, plus another.
- Replies: 15
- Views: 12207
Re: Memopak Centronics Interface, plus another.
Hi,
The Memotech is now complet.
The last Rom, without the BIOS memory segment : http://www.zx81stuff.org.uk/zx81/hardware/MemopakIF
The new ROM:
I'm working to had this hardware to Vb81.
The Memotech is now complet.
The new ROM:
I'm working to had this hardware to Vb81.
- Tue Sep 22, 2020 6:45 pm
- Forum: SALES
- Topic: Memopak Centronics Interface, plus another.
- Replies: 15
- Views: 12207
Re: Memopak Centronics Interface, plus another.
Many Thanks Erm,
It's a fast Dump !
About 108 bytes changed:
Dump in the A$ variable: Bios binary:
It's a fast Dump !
About 108 bytes changed:
Dump in the A$ variable: Bios binary:
- Tue Sep 22, 2020 5:13 pm
- Forum: SALES
- Topic: Memopak Centronics Interface, plus another.
- Replies: 15
- Views: 12207
Re: Memopak Centronics Interface, plus another.
Hi,
I typed the bytes display with the BIOS compare tool.
Original ROM, with its zero bytes readable in the bios:
Typed bytes read from the BIOS memory bloc.(hardware relocation)
62 bytes misted in the dumped Rom...
I typed the bytes display with the BIOS compare tool.
Original ROM, with its zero bytes readable in the bios:
- Tue Sep 22, 2020 12:50 am
- Forum: SALES
- Topic: Memopak Centronics Interface, plus another.
- Replies: 15
- Views: 12207
Re: Memopak Centronics Interface, plus another.
Hi Erm, I'm sorry, i put the wrong dump program ! It dumped the $2000 to $3000 memory segment… The right program will (REALLY) scan the 0-2000 memory offset. P & Wav: BiosDump.zip LOAD it, and wait the "9/4" (STOP AT LINE 4) And Save it (SAVE"DUMP") Your previous wav was clean and working. I'm sorry...